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Rifles, Reloading, Optics, Equipment
Reloading
Case over pressure and altitude.
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<blockquote data-quote="Mikecr" data-source="post: 1323572" data-attributes="member: 1521"><p>I don't know the cause here, but I'll throw a notion into it that I haven't even proven to myself..</p><p>Maybe the powder settled in cases denser toward primer. This, dependent on your load density to begin, and the Rh/dewpoint present during loading.</p><p></p><p>With a load density below ~90%, you can change MV with a gun pointed straight up -vs- straight down. Try it sometime. At the range, with witnessed consistent MV across your chronograph, chamber a round, lift the gun off bags & point it straight up. Now carefully lower the gun to level on your bags and fire. MV can be higher(+20fps). Do the same again, but after pointing the chambered round straight down. MV can be lower here(-20fps).</p><p>I come to this after misses on groundhogs in PA mountains. A lot of up & downhill shooting there, and I account for slope shooting ballistically, but there was something else contributing. After seeing it with mentioned test, I have not accepted load combinations causing <95% load density per QuickLoad.</p><p></p><p>Traveling with ammo pointed up leads to settling I'm sure, but it should not affect anything with loose powder kernels. I wonder if powder could hold enough moisture that with traveling it might sort of cake into a slug near webs. Try holding a suspect by the case head and rap it against your knee a few times before shooting. Does it make a difference?</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1323572, member: 1521"] I don't know the cause here, but I'll throw a notion into it that I haven't even proven to myself.. Maybe the powder settled in cases denser toward primer. This, dependent on your load density to begin, and the Rh/dewpoint present during loading. With a load density below ~90%, you can change MV with a gun pointed straight up -vs- straight down. Try it sometime. At the range, with witnessed consistent MV across your chronograph, chamber a round, lift the gun off bags & point it straight up. Now carefully lower the gun to level on your bags and fire. MV can be higher(+20fps). Do the same again, but after pointing the chambered round straight down. MV can be lower here(-20fps). I come to this after misses on groundhogs in PA mountains. A lot of up & downhill shooting there, and I account for slope shooting ballistically, but there was something else contributing. After seeing it with mentioned test, I have not accepted load combinations causing <95% load density per QuickLoad. Traveling with ammo pointed up leads to settling I'm sure, but it should not affect anything with loose powder kernels. I wonder if powder could hold enough moisture that with traveling it might sort of cake into a slug near webs. Try holding a suspect by the case head and rap it against your knee a few times before shooting. Does it make a difference? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case over pressure and altitude.
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