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Originally Posted by temmi
this is a safty issue
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It's not a safety issue between EVERY use.
I've not yet had to trim a single rifle case twice and I have some with 8-10 full-power loads threw them. In fact, they're not even close to needing trimming again.
I find that the case will grow to a certain point and then pretty much stop. If they don't, you're not sizing them correctly.
Properly sized cases will have very little FORWARD growth and essentially no head stretching.
Improperly sized, incorrectly headspaced cases, will grow BACKWARDS... in other words the head is stretching toward the breach. This leads eventually to head separation and is a safety issue unrelated to trimming.