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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Mysticplayer" data-source="post: 73752" data-attributes="member: 8947"><p>Kirby, my thoughts are that case volume is more critical then a slight misalignment with the neck.</p><p></p><p>You said that the exterior is match quality ie, the case w/ bullet will line up with the chamber and bore with runout approaching zero. That to me is the most important factor. Any misalignments here WILL throw off your bullet.</p><p></p><p>Next is case volume. This is a combustion chamber after all. The closer you get to identical volumes the better. If the volumes are within 2%, I would say good to go because...</p><p></p><p>The biggest variable in internal ballistics is actually the powder. Will it burn consistently enough. I am sure if you put a pressure guage on one case and fired it several times with the same amount of powder, you would get differences in pressure peak and duration. That leads to velocity variations and stringing at longer ranges.</p><p></p><p>When you get into cases that big, your powder options are limited. Will H50BMG or WCC 872 work???? Will your primers ignite this stuff consistently enough???</p><p></p><p>I have never worried much about the case as I feel it plays a small part of the accuracy equation. Of course, the case must be within the specs discussed above. Consistency in neck annealing is way more important.</p><p></p><p>All that powder goes boom in a few milliseconds and expands to many times it volume. That gas rushes out of the neck at 65000PSI and 5500fps. I just don't see it giving a rip if it is a few thou one side or the other. The neck and bore is the real funnel that matters. Since the case volume is the same and the neck/shoulder/boreline is good, the gas will travel the 'same' path.</p><p></p><p>Then there is that whole bullet barrel thing.</p><p></p><p>I bet the shape of the stock and how it recoils will play a larger role then anything associated with the case for long range accuracy.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 73752, member: 8947"] Kirby, my thoughts are that case volume is more critical then a slight misalignment with the neck. You said that the exterior is match quality ie, the case w/ bullet will line up with the chamber and bore with runout approaching zero. That to me is the most important factor. Any misalignments here WILL throw off your bullet. Next is case volume. This is a combustion chamber after all. The closer you get to identical volumes the better. If the volumes are within 2%, I would say good to go because... The biggest variable in internal ballistics is actually the powder. Will it burn consistently enough. I am sure if you put a pressure guage on one case and fired it several times with the same amount of powder, you would get differences in pressure peak and duration. That leads to velocity variations and stringing at longer ranges. When you get into cases that big, your powder options are limited. Will H50BMG or WCC 872 work???? Will your primers ignite this stuff consistently enough??? I have never worried much about the case as I feel it plays a small part of the accuracy equation. Of course, the case must be within the specs discussed above. Consistency in neck annealing is way more important. All that powder goes boom in a few milliseconds and expands to many times it volume. That gas rushes out of the neck at 65000PSI and 5500fps. I just don't see it giving a rip if it is a few thou one side or the other. The neck and bore is the real funnel that matters. Since the case volume is the same and the neck/shoulder/boreline is good, the gas will travel the 'same' path. Then there is that whole bullet barrel thing. I bet the shape of the stock and how it recoils will play a larger role then anything associated with the case for long range accuracy. Jerry [/QUOTE]
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