Bersin Ammunition Measuring Tool

8/12/2019 Bersin Ammunition Measuring Tool

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M ade in USAPaten t pend ing

This BERSIN A mm unition M easuring and A djustm entD evice is a revolutionary invention in

precision shooting. The device diagnoses and elim inates errors in the longitudinal axis in rifleammunition ( concen tr ic ity f laws) .

Unlike other tools, the device allows each cartridge to be solidly fixed within a replica of a riflecartridge ch am ber for m easuring purposes. Its accuracy of m easurem ent - p artic ula rly o f re pe atfunctions - is unique. F urtherm ore, this device is the only existing tool availa ble toda y w hich allo wsyou an exact adjustment of cartridges containing concentricity flaws with respect to unevenalignm ents of the projectile w ithin the cartridge case. In addition, the device discoversunevencar tridge case surfacesand ir regula rit ies in theseating d ep th ( to ta l length) of your ammunit ion .

Many different types and calibers of ammunition contain concentricity flaws.Industriallymanufactured a mmunition genera lly c on ta in s e rro rs o f 4 /1 ,000 to 20/1 ,0 00 (me asure d in the re gio nof th e pro jectile's tip ). F law s of up to 40 /1,000 are not u ncom mon. A sho t at a distanc e of 3 00 yardsw ith such a shell w ill forcibly m iss its target by approxim ately a foot due to the provoked rotationalimbalances.

Even carefully reloaded c artrid ge s m ay c on ta in e rro rs o f 4 /1 ,0 00 o r m ore , c au se d b y m in or m is ta ke sin the reloading process, such as a bad angle of insertion of the projectile in the case m outh. Thedev ic e genera lly re duce s these e rro rs to 1 /1 ,000 or le ss .

Through the alignm ent of the projectile's axis with the axis of the cartridge case, while firing thecartridge, the projectile is pressed in a precise m anne r into the barrel throat. T his a voids rotationa limbala nc es o f the p ro je ctile in the barre l a nd in th e tra je cto ry.

R igorous te sting in d iffe re nt a tmosphe ric ally neu tra liz ed fa cilitie s has c on firme d th e e ffic ie nc y o f th eB ER SIN device and has dem onstrated, that by m eans of a sim ple proc ess of m anual m easuring anda dju stm en ts o f th e n ew o r re lo ad ed a mm un itio n, th eprecision of your rifle shot can beimproved byup to 50% .


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W heth er y ou are a m arksm an us ing indu strially m anufac tured a mm unition or you are a reloader, thisdevice is designed for you. It will ascertain and m inim ize flaws which occur in serially produceda mmunition, a s w ell a s a lle via te ma ny proble ms o f e cc en tric ity in re loaded c artridge s.

T he device allow s fo r th equick m easurem ent of the accuracy of the cartridge, and if needed, for aninstant adjustment of the projectile with the axis of the cartridge case, all of this beingaccomplishable within seconds. It can be used for all types of shooting- p artic ula rly spo rt a ndp re cis ion shooting, bench re st shooting, o r fo r h un ting a nd sec urity purp oses .

More precise ammunition means an improvement in your shooting accuracy and a decisivereduction of your target diam eter.

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M a in b od yA dju stm en t k no bDial indicatorAd just ab le i nd ic at orDiameter compensa torI ns er te d c ar tr id ge

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60 groove61 shoulder insertL1 vertical fixation area # 1L2 clearance zoneL 3 v ertic al fix atio narea # 2


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M easures and adjusts cartridge concentricity - up to 1/10,000 of an inch

D ecisive reduction of group size - by up to 50

P in po in ts c artrid ge s w ith irre gu la r le ng th a nd c as e s urfa ce

Brin gs in du stria lly m a nu fa ctu re d a m m un itio n w ith in to le ra nc es o f re lo ad in g

H elp s re lo ad ers m ea su re a nd im p ro ve th eir h ig h p re cis io n re lo ad in g

Easy and fast handling

Top quality d ia l ind icato r (1 /10 ,000 read ing)

E xte ns iv e te stin g h as s ho wn d ra ma tic a cc ura cy im p ro ve me nt

The device weighs under one pound and comes packaged in a plastic foam lined box for easytra ns po rtin g to th e fie ld o r to th e s ho otin g ra ng e.

Verify and align your round s im mediately b efore shooting them . M easuring an d alignin g is easy andfast, just a few s econds per cartridge , or five m inutes for a box of 20 cartridges.

Improve the accuracy of every round. No more flyers. This is a must for anyone who buysc om m erc ia lly m an ufa ctu re d a mm un itio n a nd w an ts th e b es t re su lts o n e ve ry s ho t.

Even reloaders will exper ience bet te r result s.S erious reloaders are particularly concerned w ith the problem of concentricity of their carefullyreloaded am munition. E ven w ith the use of high precision tooling - prom ising a seating accuracy ofthe projectile within a 1/1,000 of an inch angle, there may be cartridges with wider flaws. This isprim arily relate d to a n on-uniform ity of the bra ss and the resulting lack of concentricity of th e neck tothe b ody o f the case. O ther rea sons m ay be a lack of experie nce or skill in the re loading process itself.


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TH E PRO BLEM : Concentricity and Eccentricity

M an y d iffe re nt ty pe s a nd c alib ers o f a mm un itio n c on ta in c on ce ntric ity fla ws . In du stria lly m an ufa ctu re d a mm un itio ng enera lly c on ta in s e rro rs o f 4 /1 ,000 to 20/1 ,000 (me asure d in th e re gio n o f th e p ro je ctile 's tip ), a lthou gh fla w s o f up to40/1,000 can also occur. A shot at a distance of 300 yards w ith such a shell w ill forcibly m iss its target by up to a footd ue to the p rovoke d ro ta tiona l imbala nc es .

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t=~~~=~- -~~ ~E ve n c are fu lly re lo ad ed b ulle ts m ay e as ily c on ta in e rro rs o f s ev era l 1 /1 ,0 00 , o fte n c au se d b y m in or m is ta ke s in th ere lo ad in g p ro ce ss , s uc h a s a s lig ht m is alig nm en t o f th e p ro je ctile d urin g its in se rtio n in th e c as e m ou th o r th e u se o fu ne ve n b ra ss . T he B ER SIN d ev ic e g en era lly a llo ws th e d ete ctio n a nd e ve n re du ctio n o f th es e e rro rs to u nd er 1 /1 ,0 00(0 .025 mm). In re loaded h igh p re cis ion a mmun itio n p ro du ce d w ith th e mo st re ce nt h ig hly sop his tic ate d re load inge qu ip me nt, th e ta rg ete d 0 .0 01 a cc ura cy c an b e c on tro lle d a nd w ill b e im pro ve d to w ith in a fe w 1 /1 0,0 00It .

T he re su lt o f m ea su rin g a nd a dju stm en t o f th e rifle c artrid ge is a m uc h c lo se r ta rg et d ia me te r.

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Bym ea ns o f a s im ple p ro ce ss o f m an ua l m ea su rin g a nd a dju stm en t o f in du stria lly m an ufa ctu re d o r re lo ad eda mm un itio n, th e e cc en tric ity fla ws c an b e c orre cte d d ra ma tic ally in cre as in g th e a cc ura cy o f y ou r s ho t b y u p to 5 0% .

B y a lig nin g th e p ro je ctile 's a xis w ith th e a xis o f th e c artrid ge c as e, th e p ro je ctile is p re ss ed m ore a cc ura te ly in to th eb arre l th ro at. T his a vo id s ro ta tio na l im ba la nc es in th e p ro je ctile b efo re a nd a fte r th e b ulle t le av es th e b arre l. Am is alig ne d p ro je ctile in th e c artrid ge c as e e nte rs th e b arre l o f th e rifle o n a ng le a nd s lig htly d efo rm ed . T he la nd s a ndg ro ov es o f th e b arre l w ill fu rth er d efo rm th e p ro je ctile a s it e nte rs th e b arre l c au sin g it to ro ta te n on un ifo rrn ly d ow n th eb arre l. T his c re ate s w ha t is g en era lly c alle d a fly er o r e rra tic s ho t.


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Rigorous testing in different atm ospherically neutralized facilities at a 335 yarddistance confirm the efficiency of the B ER SIN de vice. N um erous shot p atterns w ereestablished for ammunition set up using the BERSIN ammunition tester by thefo llo win g: In du stry (S IG S wiss In du stry U nio n; S wis s A rm s, a b ra nch o f S IG ; G ru en ig& E lm ig er, S witze rla nd ), a s w ell a s in de pe nd en t o r g ove rn me nta l o rg an iza tio ns (e .g .Austrian Ammunition Office Vienna). Other tests were executed by some top

athle tes in precision sh ooting. Th e shot patterns below d epict the re sults that can beobtained by using the BE RSIN device.

Ple ase note that all patte rn s w ere esta blishe d in a tunnel, at a distance of 335 yards,w ith a fixed ba rrel, and different ca libers and am mu nition types. T he scale is slig htlyreduced, the actual circle diam eter of the inner target circle is four inches. The leftside shows the test results without the use of the BERSIN device, the right sidep ro ve s th e ve ry o bvio us im pro ve me nt a fte r m ea su rin g a nd a lig nin g th e c artrid ge s.

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FreQuentlv asked Q uestions

W hat is the m eaning of Measuring ? M ea su rin g w ith re sp ec t to th e B ER SIN d ev ic e is d efin ed a s tu rn in g a rifle ca rtrid gearoun d its lonQ itudin al axis inside a replica o f a ca rtridge cham ber, the tip of the dial

indica tor tou ching the cartridge in the area of the projectile's tip. D uring a full turn ofthe cartridge (360 ), flaw s in the longitudinal axis of the cartridge (projectile w ithrespect to the cartridge case) can easily be detected by reading the indicatordeviation.

Is there an obvious need for Measuring ?Ideally the longitudinal axis of the cartridge case and the projectile are preciselyequal and alig ned. In su ch case , the deviation of the ind icator's n eedle is O . In fact, itis not uncom mon that with industrially m anufactured am munition one observesdeviations b etw een 4/1,000 and 2 5/1,000 . R eloade d am m unition ha s de cisivelylesser flaw s, provided they are produced by an experienced person w ith the utm ostc are , u sin g h ig h p re cis io n re lo ad in g to ols . H ow ev er, e ve n u nd er s uc h c irc ums ta nc es ,o ne c an v ery o fte n o bs erv e d ev ia tio ns b etw ee n 2 /1 ,0 00 a n d 8 /1 ,0 00 .

W hat is the m eaning of Adjustm ent ?By turning the alignment knob, detected mistakes in the longitudinal axis of theprojectile with respect to the cartridge case will be corrected. The alignm ent tip,rounded off or equipped w ith a ball joint and touching the projectile in the area closeto its tip , th ere by m ove s th e p ro je ctile sid ew ay s, u ntil b oth a xe s a re p erfe ctly a lig ne d.The entire process is controlled and dosed by a high precision dial indicator,d isplayed in to subdiv ided1/100 m m (4/10 ,000 ) u nits (or for particula r tools in benchrest and varmint hunting, into 5/1,000 mm (2/10'000 ) units). The contact of theadju stm ent tip w ith that of the projectile tip is carefully chosen to guarantee an equal

d is trib utio n o f th e a lig nin g fo rc es o n th e p ro je ctile .

Can you loosen the projectile in the cartridge case by adjusting it?Basically there is no risk of loosening the projectile in its seat in the case throat,p ro vid ed th e u se r fo llo ws th e in stru ctio ns in th e m an ua l. T he s ta bility o f th e p ro je ctilein the cartridge case is m aintained. H ow ever, there is a m inor risk of loosening theprojecti le when:

. there has been an inappropriate adjustment made ( this can occur whenp ush in g th e p ro je ctile s eve ra l tim es fro m o ne e nd to th e o th er- applyinge xce ed ed p re ss ure a nd th en p us hin g b ac k th e p ro je ctile ); o r

. there is poor quality brass or porous cartridge cases with exorbitantc once ntric ity fla ws .

H ow ever, the thus re sulting slight re duction in neck tension of the projectile w ill notha ve any negative im pact on the precision of the shot.

W hat are the consequences of the adjustment process on the projectile?At an initial stage, there is lateral pressure applied on the projectile w ith the help ofthe adjustm ent knob. The contact area is chosen in a way to ensure that there is aneven pressure concentration on the projectile in its entire length and positioning.P ro je ctile s w ith a th in co atin g m ay re qu ire a m ore so ph is tica te d a lig nm en t- speciallym anufactured alignm ent tips protect against any kind of deform ation or dam age onthe projectile's surface.


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The initially executed pressure m oves th e projectile in its po sition in the ca se neck.C a rtrid ge s w ith min or c on ce ntric ity fla ws a re th en a lig ne d, w ith ou t fu rth er a dju stme nt.W here a cartridge does have m ajor deviations, there is a first m ove of the projectilein the case neck, followed by a second move of the case neck as a whole in itstran sitio n zone in to the case should er. This area of the ca rtridge case is ofte n reasonfor m ajor concentricity problem s. At that weakest area of the case, the pressurea pp lie d c on ce ntra te s its elf a nd b rin gs th e d es ire d im pro ve me nt in c on ce ntric ity to th ewhole cart ridge.

What are the consequences of the adjustment on the neck tension?T he m in im al re du ctio n o f th e n ec k te ns io n a sce rta in ed w ith a lig ne d a mm un itio n d oe sn ot h av e a ny n eg ativ e e ffe cts o n p re cis io n a nd ta rg etin g. O n th e co ntra ry, te stin g h asrevealed that a slightly reduced neck tension can have a positive effect w ith respectto precision. For exam ple, in the case of an industrially m anufactured com petitionammunition - these relatively precise com petition cartridges have a decisivelyreduced neck tension (Le., up to 70% ) compared to regular over the counterammunition.

H ow about dam aging the projectile by alignm ent pressure?This question addresses a serious problem . Each dam age or torsion on the coatingof the projectile causes similar out of round problems in the same manner aseccen tr ic ity o f the cartr idge .A s a m atter of fact, there are a num ber of re latively thin o r so ft-coated cartridges. T heconcentration of alignment pressure executed, by a rounded off alignment tip,dam aging of the pro jectile cannot alw ays be excluded . T he m anu factu ring of certainmodels, such as Bench Rest, Varmint Hunting, as well as Large Rifle and UltraM ag nu m, c are fu lly c on sid er th es e c irc um sta nce s. A h ig hly so ph is tica te d a lig nm en ttip equipped w ith a ball joint and a relatively large touching zone to the projectilem ake s a ny d am ag e to th e co atin g v irtu ally im po ss ib le .

M easuring and alignm ent of cartridges with uneven case surfacesWith th e h elp o f d ia me te r co mp en sa to rs o pp osite th e d ia l in dic ato r, it is ve ry p oss ib leto measure, as well as align, cartridges with uneven cartridge cases. W hat isimportant to note is that out of round cases with uneven exterior surfaces will beidentified by an irregular deviation of the indicator needle. Sudden m ovem ents inopposite directions indicate, an out of round or dam aged case (another im portantfu nc tio n o f th e B ers in d ev ic e).

How can flaws in the seating depth (total length) be identified?In p artic ula r, a fte r th e a dju stm en t p ro ce ss , a n u ne ve n se atin g d ep th o f th e p ro je ctile

can be identified by a differing deviation o f the need le com pared to othe r cartridgesof the sam e type and/or calibre - w he n c omp arin g d iffe re nt c artrid ge s, th e d ev ia tio nof the indicator should be som ew hat even w ithin a few1/100 m m (4 /1 0,0 00 ). O nc eyou experience a particular m ove of the indicator in a positive or negative directionwith a certain cartridge (com pared to other cartridges), this will im ply a flaw in thes ea tin g d ep th o f th e p ro je ctile (to ta l le ng th o f th e c artrid ge ).At this point and tim e it m ust be em phasized that this verification in practice is oftendone with a couple of specific devices without initial control of the axis (Le. av erific atio n o f th e a lig nm en t o f th e p ro je ctile w ith th e ca rtrid ge c as e). S uch re su lts a reunreliable, in particular when measuring is executed in a lateral m anner on thep ro je ctile . U nd er s uc h c irc ums ta nc es , th e B ers in d ev ic e is o f g re at a ss is ta nc e.


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What are the technical consequences of eccentricity of a cartridge?A few technical details are necessary in order to understand the followinge xp la na tio ns w ith re sp ect to co nc en tric ity/e cc en tric ity: A fte r ig nitin g th e lo ad o f th eca rtrid ge , th e p ro je ctile is su bje cte d to h ug e fo rc es a nd tre me nd ou sly a cc ele ra te d. Itthen leaves the neck of the case and passes the relatively short transition zone to bepressed into the base of the barrel. This passage of the projectile from thea cc ele ra tio n to th e e ntra nc e in to th e a ctu al b arre l is c alle d ro ta tio n le ss (th ere is n ogrip by the lands and grooves of the barrel at this stage), the stage betw een leavingthe case m ou th and be ing pressed into the barrel is called free m ovem en t .In ideal circum stances, i.e. w ith a perfect alignm ent of the cartridge and thereby afully round m ovem ent of the pro jectile, the projectile is pressed into the barrel thro atand into the barrel in a precisely centric way. This m eans, any deform ation and/orro ta tio na l imb ala nc e o f th e p ro je ctile c an b e e xc lu de d.O n the othe r hand, if th ere is a n eccen tricity betw een the projectile and the cartridgecase, you w ill note a relevant deform ation of the projectile before it is even pressedinto the barrel, w hich w ill ine vitably lead to a rota tiona l im balan ce of the projectile.This im balance is not, as one m ight assum e, dam pened or neutralized by the fields

and grooves of the barrel, but m ay even be accentuated during the stage of passingthrough the barrel. At the very end, the projectile will, once it leaves the end of theb arre l, c on tin ue a nd e nh an ce its elf d urin g th e e ntire tra je cto ry.B y the m ere fact that there is an uneven deform atio n of the pro jectile du ring th e firin gprocess, before its actual entrance into the barrel, the exactitude and precision oftargeting is seriously ham pered - the technical diameter of group size (targetd ia mete r) o f a fix ed b arre l w id en s to a sto nis hin g d ime ns io ns .

U tility of the device for the reloaderAlthough the device m ost visibly (physical reduction of group size) yields to theconsumer of industrially manufactured ammunition, the use for reloaders is(p erc en ta ge w is e) n on e th e le ss e ffic ie nt a nd h ig hly re co mme nd ed .

Nowadays a couple of high precision reloading tools promise, particularly withrespect to seating depth accuracy, precision dim ensions of up to 1/1,000 of an inch(0.025 mm). W hether or not these manufacturers can keep their promise is aquestion w e w ill not discuss- this question can only be answ ered by conducting aninspection w ith a sim ilar precisio n m easurin g d evice. R eg ardless, it doe s not m akesense to address high precision seating depth without keeping a close eye on theco nce ntricity o f y ou r ca rtrid ge a t th e sa me tim e- d oin g s o, w ill u nd ou bte dly fa ls ify th ea cc ura cy o f y ou r re su lts a s th ey p erta in to s ea tin g d ep th o f yo ur p ro je ctile .As m entioned above the real problem in this context lies in the fact that there are noreliable m easuring devices available. In pa rticular repe at-functions a re often veryunsatisfying, and hazardous dial indicators have scale units w hich are never at alevel of 1/10'000 . The Bersin device makes up for all hazards in this regard. Inaddition, the device allows you to align your cartridge to the utmost possibleconcentricity dimension.Even the m ost experienced reloaders adm it that, on a regular basis, m istakes suchas a slightly bad angle occurs w hile inserting the projectile. These m istakes are sominor that they hardly are noticeable and therefore very difficult to avoid.N eve rth ele ss, in p ra ctic e it is e xa ctly th es e fla ws w hic h m ak e th e d iffe re nce b etw ee nthe cham pionship an d a b ad day. E ven the best hig h precision reloading tools are nota re lia ble w ea po n a ga in st th es e a nn oy in g fla ws.In addition it is w ell known that a m ajor percentage of flaw s in concentricity are noteven caused by reloading inaccuracy, but by lacks of concentricity in the brass.

U neve nness in the brass reacts on pressure and other physical influe nce during thereloading process w ith in turn eith er provo ke eccen tricity or out of ro und problem s of


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th e c artrid ge c as e - both of w hich a re taken along into the loaded cartridge. Thesemistakes can only to be identified in a reliable way once the reloading process isfinalized. Condition for a precise establishment is a highly precise measuring devicew ith an absolute accuracy of repeat functions.

To d ate, only the B ersin device offers you the capacity to m easure, control and aligna ll a t once thus it is h ighly recommended .

W hat am I supposed to do with a damaged and/or unsuitable device (i.e.,size of the cartridge doesn't match the size of the device bore)?If th e d ev ic e is fla we d w ith d efe cts in m ate ria l a nd /o r w ork ma ns hip , th e m an ufa ctu re ro f th e d evic e o ffe rs a th re e-m on th o pe ra tin g w arra nty fro m th e o rig in al p urc ha se d ateand you may return it to the manufacturer. The manufacturer will honour saidwarranty provided that the guidelines for operating and care mentioned in theO w ne r's M an ua l h av e b ee n fo llo we d.

It is important to note that each device, including the dial indicators, are testedseveral tim es be fore le aving the m anufacturer's facilities. Therefore , a s a re sult ofsuch rigorous testing, and given that each device is wrapped in shock proofpackaging, a lack in operating ability is highly im probable provided the plastic foilweld ing is untouched.

This being said, if for any reason, you are unhappy w ith you r d evice, becauseit does not fulfill its intended usage, please contact the manufacturer([email protected]).

The bores for the cartridges (replicas of cartridge chambers) are specified bydifferent calibre groupings of different dim ensions. All bores (w hatever size thedevice) are based on international SAAM I-specifications for weapon (cartridgecha mbers) and am munition (cartridge case) m anu factu ring. Therefore, a reloadedcartridge (w hich is slightly w iden ed) w ill still fit w ithin the b ore of the B ersin device,provided the cartridge cham ber of the used w eapon w as m anufactured in keepingw ith th e in te rn atio na l S AA MI-s pe cific atio ns a s th ey re la te to to le ra nc es . A cc ord in gly,the slightly w idened reloaded cartridge (Le. the case) can still be inserted into thea pp ro pria te b ore w ith n o p ro ble m.

It is im portant to note tha t durin g th e m anufacturing process, the bore's tolerancescannot be overstretched to address this potential im perfection in the cartridgechamber of the weapon: addressing such rare and explicit imperfections (Le.,unsuitable rifle m anufacturing or oversized cartridge cham bers) by excessive

w id en in g o f to le ra nc es w ou ld im pe de th e e xa ctitu de /p re cis io n o f th e b ore 's d evic e fo rth e v as t m ajo rity o f u se rs .

This being said, if your reloaded cartridge does not fit into the appropriate bore,despite the fact that the size of the cartridge is intended for this specified bore size,you m ost likely are faced w ith an oversized cartridge cham ber of your rifle- . Undersu ch c ircu msta nce s, th e a pp lic ab le w arra nty w ou ld n ot a pp ly. H ow ev er, y ou a re m ostw elcom e to con tact the m anufa cturer at im achine @localnet.com w ho w ill attem pt toassist you in resolving this issue by widening the bore of your device. Suchadjustm ents do not carry any w arranty, and all ensuing costs are to be paid in full bythe customer.

Bersin Ammunition Measuring Tool

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