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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rem 300 Ultra Brass Weight Variance
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<blockquote data-quote="Mysticplayer" data-source="post: 23758" data-attributes="member: 8947"><p>Brent,</p><p></p><p>Welcome to the world of slightly less A-retentive reloaders. What you have observed is probably common to all brass made by all manf. The only thing that matter are the consistency of the metal/annealing and the true internal case capacity. As long as the above are the same, the presure and release of the bullet will also be the same. This assumes no major physical flaws with the brass like being out of round or offset flash holes (although not sure how important that is too - another story).</p><p></p><p>Try this experiment with a old magnum case. Measure the weight, then cut a slot on the rim and reweigh. Bet you it will show a change of 1/2 grain or more. How could that affect the internal capacity of the brass? So slight manufacturing differences will show up as differece in case weight, even though internal capacity is the same.</p><p></p><p>By this same argument, cases that weigh the same may not necessarily have the same internal volume. Think about that one.</p><p></p><p>What I do to test my cases is, find a good accurate load and fire all the cases with the same load. Any shot that is sig. out of the group ie flyer, I mark the brass. When that brass is reshot, if it is still a flyer, into the garbage it goes. The further you shoot on a calm day, the better the results. I use 200yds as a baseline.</p><p></p><p>When I start to get a neck split or two, all that batch of brass gets annealed. If problems occur elsewhere, I toss the batch and start with fresh brass.</p><p></p><p>The RUM I am working on is showing signs of being a 1/2 MOA gun. This is with once fired range brass from who knows how many lots, batches, or firearms. At least your stuff came from the same box.</p><p></p><p>Enjoy...</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 23758, member: 8947"] Brent, Welcome to the world of slightly less A-retentive reloaders. What you have observed is probably common to all brass made by all manf. The only thing that matter are the consistency of the metal/annealing and the true internal case capacity. As long as the above are the same, the presure and release of the bullet will also be the same. This assumes no major physical flaws with the brass like being out of round or offset flash holes (although not sure how important that is too - another story). Try this experiment with a old magnum case. Measure the weight, then cut a slot on the rim and reweigh. Bet you it will show a change of 1/2 grain or more. How could that affect the internal capacity of the brass? So slight manufacturing differences will show up as differece in case weight, even though internal capacity is the same. By this same argument, cases that weigh the same may not necessarily have the same internal volume. Think about that one. What I do to test my cases is, find a good accurate load and fire all the cases with the same load. Any shot that is sig. out of the group ie flyer, I mark the brass. When that brass is reshot, if it is still a flyer, into the garbage it goes. The further you shoot on a calm day, the better the results. I use 200yds as a baseline. When I start to get a neck split or two, all that batch of brass gets annealed. If problems occur elsewhere, I toss the batch and start with fresh brass. The RUM I am working on is showing signs of being a 1/2 MOA gun. This is with once fired range brass from who knows how many lots, batches, or firearms. At least your stuff came from the same box. Enjoy... Jerry [/QUOTE]
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Rem 300 Ultra Brass Weight Variance
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