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Rifles, Reloading, Optics, Equipment
Reloading
Cases seems to grow too much
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<blockquote data-quote="lancetkenyon" data-source="post: 2722646" data-attributes="member: 68875"><p>It is a serious misconception that an AI doesn't grow and never needs trimming. </p><p>I have been shooting AIs and many other "improved" cartridges for over 20 years. </p><p></p><p>A lot of the misconception comes from people that do not shoot thwm enough. And reload their brass 7-15+ times.</p><p></p><p>An AI takes a parent case and blows it out, pushes shoulders forward, and sharpens to 40°. All this shrinks the case OAL by a lot. Upwards of .018-.020". So if you started with virgin brass that is already .010" short, you could be anywhere from .022- .026" short of OAL case length (usually AI chambers start as close as a crush fit for virgin brass OAL).</p><p></p><p>So, if you are growing .003-.005" every firing/resized cycle, it might take you 5-7 reloads or more to finally grow back to chamber length. Then, if you trim .010" after that, you might have to start trimming every 2-4 cycles at that point.</p><p></p><p>I usually find around .003" per cycle, so usually don't have to start trimming until reload #7 or 8.</p><p></p><p>My experience is with:</p><p>.22-250AI</p><p>.243 AI</p><p>.250AI</p><p>.25-06AI</p><p>.260AI (x3 rifles)</p><p>6.5-06AI</p><p>6.5-.270AI</p><p>6.5-280AI</p><p>6.5 Sherman</p><p>6.5SS (x8 rifles)</p><p>6.5PRC/SI</p><p>7SS (x4 rifles)</p><p>.280AI</p><p>And a few others as well</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 2722646, member: 68875"] It is a serious misconception that an AI doesn't grow and never needs trimming. I have been shooting AIs and many other "improved" cartridges for over 20 years. A lot of the misconception comes from people that do not shoot thwm enough. And reload their brass 7-15+ times. An AI takes a parent case and blows it out, pushes shoulders forward, and sharpens to 40°. All this shrinks the case OAL by a lot. Upwards of .018-.020". So if you started with virgin brass that is already .010" short, you could be anywhere from .022- .026" short of OAL case length (usually AI chambers start as close as a crush fit for virgin brass OAL). So, if you are growing .003-.005" every firing/resized cycle, it might take you 5-7 reloads or more to finally grow back to chamber length. Then, if you trim .010" after that, you might have to start trimming every 2-4 cycles at that point. I usually find around .003" per cycle, so usually don't have to start trimming until reload #7 or 8. My experience is with: .22-250AI .243 AI .250AI .25-06AI .260AI (x3 rifles) 6.5-06AI 6.5-.270AI 6.5-280AI 6.5 Sherman 6.5SS (x8 rifles) 6.5PRC/SI 7SS (x4 rifles) .280AI And a few others as well [/QUOTE]
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Reloading
Cases seems to grow too much
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