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Rifles, Reloading, Optics, Equipment
Reloading
Case trim length
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<blockquote data-quote="fiftybmg" data-source="post: 1857403" data-attributes="member: 96316"><p>That's a side effect of trimming, not why we trim.</p><p></p><p>The reason you must keep your cases to below specification length, is to prevent the case mouth being pinched in the throat when chambered.</p><p></p><p>Wether you trim to 0.001 or 0.003 below maximum is not too important.</p><p></p><p>If the case is too long, the case mouth is prevented from releasing the bullet normally, causing a pressure buildup. This can show as loosened primer pockets, blown out primers or a sticky / stuck bolt.</p><p></p><p>It may be that your rifle brass never needs trimming, but it should always be measured before each reload.</p><p></p><p>This applies to all bottleneck rifle brass, maybe someone can tell us if their 357 Magnum and larger straight wall rifle brass ever needed trimming.</p></blockquote><p></p>
[QUOTE="fiftybmg, post: 1857403, member: 96316"] That's a side effect of trimming, not why we trim. The reason you must keep your cases to below specification length, is to prevent the case mouth being pinched in the throat when chambered. Wether you trim to 0.001 or 0.003 below maximum is not too important. If the case is too long, the case mouth is prevented from releasing the bullet normally, causing a pressure buildup. This can show as loosened primer pockets, blown out primers or a sticky / stuck bolt. It may be that your rifle brass never needs trimming, but it should always be measured before each reload. This applies to all bottleneck rifle brass, maybe someone can tell us if their 357 Magnum and larger straight wall rifle brass ever needed trimming. [/QUOTE]
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Reloading
Case trim length
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