.30 carbine crimp question

[macgunner01]

Thank you for your reply, Larry!

You really need to quit crimping the case mouths. The >30 Carbine headspaces on the case mouth and absolutely no crimp is required. If you do anything simple taper crimp to straighten and remove the case mouth flare. You are asking for some serious misfires in eithe and M1 Carbine or a Ruger BH.

I definitely know about not crimping the bullet into place. My only question was how much of a taper is sufficient (because of explicitly not wanting to apply too much taper). The RCBS dies have a taper crimp die, and the most I'd ever apply is just to straighten the case belling.

Also the bulge below the base of the bullet is caused because the case is sized too much. It is called the "coke bottle effect". If you don't want it then simple back out the FL carbide die a little at a time until it goes away.

Larry Gibson

That is a great piece of info to know! I will definitely keep that in mind! A case suffering from the "coke bottle effect" is still safe to shoot though, correct?