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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Velocities
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<blockquote data-quote="edward hogan" data-source="post: 303263" data-attributes="member: 1341"><p>If chasing max velocities, why not run a Molyed bullet?</p><p></p><p>Understand the arguments about moly, and never being able to completely clean a molyed bore, but so what if your barrel life is under 800 rds anyway? Pretty hard to deny the velocity boost moly enables, and if you have an optimum velocity value, it should enable you to achieve that velocity with reduced powder charges. Better barrel life with less friction and reduced powder burning. Just an idea...</p><p></p><p>As far as any modern magnum goes, seems 65,000psi is the SAAMI spec, Lapua cases are for sure about the highest quality. Maybe to determine pressure from "signs" like primer pocket looseness, try your loads in Hornady brass? I do seem to recall a magnum specified at 68k or 70k PSI? Might have been the .408 Chey-Tac in the preliminary look-see done in Tactical Shooter back in 2000/01...</p><p></p><p>Maybe using moly disturbs bullet flight once the projectile enters the transitory velocity phase? I still don't buy that concept as critical or even important. Funny how the PALMA shooters manage fairly well with those 155gr .308 bullets arriving on target at 1000yds going about 1100fps at their destination. And then there's the Dominion Rifle Club of Canada article with 2.5" vertical dispersion at 1000yds for 15-20rd .223Rem groups fired with 90gr JLK bullets. Maybe a .22-250AI with 6.5 twist will outshoot them all? Of course, there's that pesky transition velocity stuff... Evidently nobody told those 90gr JLK's they weren't supposed to stay .25moa or better all the way to 1000yds...</p><p>Link below to DRC issue w/90gr JLK testing results:</p><p></p><p><a href="http://209.85.173.132/search?q=cache:nstMuEmZitkJ:www.dcra.ca/Marksman/Winter%2520Spring%25202008%2520Edition.pdf+JLK+bullets+1000+yds+canada&hl=en&ct=clnk&cd=18&gl=us&client=firefox-a" target="_blank">Winter/Spring 2008 ....Inthis issue</a></p></blockquote><p></p>
[QUOTE="edward hogan, post: 303263, member: 1341"] If chasing max velocities, why not run a Molyed bullet? Understand the arguments about moly, and never being able to completely clean a molyed bore, but so what if your barrel life is under 800 rds anyway? Pretty hard to deny the velocity boost moly enables, and if you have an optimum velocity value, it should enable you to achieve that velocity with reduced powder charges. Better barrel life with less friction and reduced powder burning. Just an idea... As far as any modern magnum goes, seems 65,000psi is the SAAMI spec, Lapua cases are for sure about the highest quality. Maybe to determine pressure from "signs" like primer pocket looseness, try your loads in Hornady brass? I do seem to recall a magnum specified at 68k or 70k PSI? Might have been the .408 Chey-Tac in the preliminary look-see done in Tactical Shooter back in 2000/01... Maybe using moly disturbs bullet flight once the projectile enters the transitory velocity phase? I still don't buy that concept as critical or even important. Funny how the PALMA shooters manage fairly well with those 155gr .308 bullets arriving on target at 1000yds going about 1100fps at their destination. And then there's the Dominion Rifle Club of Canada article with 2.5" vertical dispersion at 1000yds for 15-20rd .223Rem groups fired with 90gr JLK bullets. Maybe a .22-250AI with 6.5 twist will outshoot them all? Of course, there's that pesky transition velocity stuff... Evidently nobody told those 90gr JLK's they weren't supposed to stay .25moa or better all the way to 1000yds... Link below to DRC issue w/90gr JLK testing results: [url=http://209.85.173.132/search?q=cache:nstMuEmZitkJ:www.dcra.ca/Marksman/Winter%2520Spring%25202008%2520Edition.pdf+JLK+bullets+1000+yds+canada&hl=en&ct=clnk&cd=18&gl=us&client=firefox-a]Winter/Spring 2008 ....Inthis issue[/url] [/QUOTE]
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