Once you know the "actual chamber length" that you'll get when you measure it with the "plugs", you may not need/want to trim at all. If I know that my brass is .025 or .030 shorter than the "actual chamber length" I won't bother to trim.
I havn't trimmed brass in a "long time". I neck size and shoulder bump so my brass doesn't grow. And more than likely your brass will probably be .020 to .040 shorter than the "actual chamber length". (Max case length) If you want to trim your brass, get after it. I'de rather be pulling the trigger.
On my chambers,
6BR max case length is 1.560 and the "actual chamber length" is 1.580.
.221 Fireball max case length is 1.400 and the "actual chamber length" is 1.427.
22BR max case length is 1.560 and the "actual chamber length" is 1.585.
Trim your barss if you've got nothing better to do but like I said, I'de rather be pulling the trigger. ;D YMMV.
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