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Rifles, Reloading, Optics, Equipment
Reloading
case weighing
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<blockquote data-quote="Fiftydriver" data-source="post: 75126" data-attributes="member: 10"><p>Nelsonic,</p><p></p><p>I am not a BR shooter but I am a long range varmint, predator and big game shooter and an accruacy minded gunsmith.</p><p></p><p>I personally feel case weight is an important issue with accuracy but for anything short of a full bench rifle designed for competition, it is not quite as critical as some other aspects of a handloaded round, namely, neck and bullet run outs and neck thickness uniformity.</p><p></p><p>That said, the smaller a case is in volume the more critical case weight can be to getting consistant velocities.</p><p></p><p>A 2 gr difference in case weight in a case the size of a RUM is really not extremely detrimental to consistancy, this same variation in a 223 Rem and you can go from comfortable top loads to loosening the primer pocket in pressures.</p><p></p><p>When I am sorting brass for extreme accuracy, I generally set my range specs for .5 grains of variation for every 40 gr case capacity.</p><p></p><p>For example, for a 223 Rem class round(17 Rem, 204, 222, 223, etc...) I will set a weight range limit of roughly .3 gr variation and sort brass into these ranges.</p><p></p><p>For the 22-250 class which I include in the 220, and 243 as well, I will look to hold a .5 gr range.</p><p></p><p>For the standard magnum rounds, 7mm Rem Mag, 300 Win Mag, 338 Win Mag, etc... I will use 1 grain for a standard varaiton.</p><p></p><p>And finally the RUM class cases and larger I try to keep them at 1.5 gr variation.</p><p></p><p>Now if I am loading for extreme accuracy or for extreme range shooting I will look to get these big cases grouped into 1 grain lots or less but for everything else it is not this critical.</p><p></p><p>Again, I would say the single most critical dimension to accuracy loads in neck and bullet run outs and keeping them as low as possible. True BR quality is 0.001" of run out or less.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 75126, member: 10"] Nelsonic, I am not a BR shooter but I am a long range varmint, predator and big game shooter and an accruacy minded gunsmith. I personally feel case weight is an important issue with accuracy but for anything short of a full bench rifle designed for competition, it is not quite as critical as some other aspects of a handloaded round, namely, neck and bullet run outs and neck thickness uniformity. That said, the smaller a case is in volume the more critical case weight can be to getting consistant velocities. A 2 gr difference in case weight in a case the size of a RUM is really not extremely detrimental to consistancy, this same variation in a 223 Rem and you can go from comfortable top loads to loosening the primer pocket in pressures. When I am sorting brass for extreme accuracy, I generally set my range specs for .5 grains of variation for every 40 gr case capacity. For example, for a 223 Rem class round(17 Rem, 204, 222, 223, etc...) I will set a weight range limit of roughly .3 gr variation and sort brass into these ranges. For the 22-250 class which I include in the 220, and 243 as well, I will look to hold a .5 gr range. For the standard magnum rounds, 7mm Rem Mag, 300 Win Mag, 338 Win Mag, etc... I will use 1 grain for a standard varaiton. And finally the RUM class cases and larger I try to keep them at 1.5 gr variation. Now if I am loading for extreme accuracy or for extreme range shooting I will look to get these big cases grouped into 1 grain lots or less but for everything else it is not this critical. Again, I would say the single most critical dimension to accuracy loads in neck and bullet run outs and keeping them as low as possible. True BR quality is 0.001" of run out or less. Good Shooting!! Kirby Allen(50) [/QUOTE]
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