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Rifles, Reloading, Optics, Equipment
Reloading
Run-out help needed
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<blockquote data-quote="Mikecr" data-source="post: 737295" data-attributes="member: 1521"><p>Two reasons you can't get below 3thou in TIR Bart:</p><p>-You haven't culled out cases with thickness variance</p><p>-You over-size</p><p></p><p></p><p>Also, there is a difference between separate or combined body die/partial neck sizing, and actual FL sizing. They're not the same.</p><p>'Full length bushing dies' ARE NOT FL dies. They do not full length size.</p><p></p><p>Bullet Bumper's post pretty well described a few potential approaches to reducing runout.</p><p>Missed, maybe I missed, is that there are three main causes of runout:</p><p>-Thickness variance</p><p>-Sizing</p><p>-Poor cartridge design</p><p></p><p>A 30-06 brings all three to front & center.</p><p>It's length to width to cal is all wrong. It has high body angle and low shoulder angles. </p><p>This causes an immediate need for greater sizing than better designed cartridges ever need.</p><p>Any thickness variance bows a 30-06 more than better designed cartridges.</p><p>It is ballistically inefficient and much of the unburned powder merely adds to bullet mass, increasing recoil and muzzle pressures.</p><p>When you find no gain in straighter, better chambering fit 30-06 cases, it's because you've already reached the cartridge's potential(it's not a bench rest cartridge).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 737295, member: 1521"] Two reasons you can't get below 3thou in TIR Bart: -You haven't culled out cases with thickness variance -You over-size Also, there is a difference between separate or combined body die/partial neck sizing, and actual FL sizing. They're not the same. 'Full length bushing dies' ARE NOT FL dies. They do not full length size. Bullet Bumper's post pretty well described a few potential approaches to reducing runout. Missed, maybe I missed, is that there are three main causes of runout: -Thickness variance -Sizing -Poor cartridge design A 30-06 brings all three to front & center. It's length to width to cal is all wrong. It has high body angle and low shoulder angles. This causes an immediate need for greater sizing than better designed cartridges ever need. Any thickness variance bows a 30-06 more than better designed cartridges. It is ballistically inefficient and much of the unburned powder merely adds to bullet mass, increasing recoil and muzzle pressures. When you find no gain in straighter, better chambering fit 30-06 cases, it's because you've already reached the cartridge's potential(it's not a bench rest cartridge). [/QUOTE]
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