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Old December 6, 2012, 12:54 AM   #11
Senior Member
Join Date: March 16, 2010
Posts: 733
Nothing bad will happen if you dont trim a straight wall pistol case, since it headspaces on the case mouth, worst case scenario it wont fully chamber and the gun wont fire since its out of battery. Of course thats not generally a problem since normally the problem is them shrinking, not growing like a bottleneck case does.

The reason we HAVE to make sure we keep bottleneck rifle cases trimmed is since they headspace on the shoulder, if they are too long the case can intrude into the barrel throat, which is narrower than the chamber, when fired the case cannot expand enough to release the bullet easily, and pressure spikes... not good.
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