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I am loading .30 carbine on the 550b. I am new to reloading. Have been reading and studying for years.
for the record:
I am using military LC new,never fired pulled and deprimed brass. pulled 110 FMJ. Pulldown powder WC820. CCI #41 primers.
Question is about trimming. I notice that the brass measures about 1.286" +-.001" before sizing. After sizing is 1.294" which is now over the max. 1.290". Book trim length is 1.280"
Should I not resize the new brass the first time until I shoot it once? Or should I resize it all and trim to book trim length for uniformity? I didn't think straight walled cases would stretch much. I know the .30 carbine has a slight taper to it though.
TC
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Posted by: dillon
Posted on: 2008-03-10 at 10:22:46 AM
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30 Carbine cases actually stretch a fair amount, due to their tapered shape. Most carbines have enough play that new brass should work without sizing. Before loading thousands of them though, load a few and be sure the bullet is held tightly in the case after sizing but before crimping. If the bullet is loose, then resize the entire batch of brass.
