The Firing Line Forums - View Single Post

Cloudpeak · January 30, 2010, 08:54 AM

I taper crimp my 9's to .375".

I'm sure you know, but some reading this thread might not. In pistol cartridges that headspace on the case mouth, you use the taper crimp to remove the case mouth bell and you don't roll crimp as you do on revolvers. IMO, you derive little to no bullet holding capability from taper crimping. You taper crimp so the ammo will feed and chamber properly.

I always check for setback when first setting up. If there's a setback problem, it's caused by the sizer not sizing enough or the case mouth expander being to large of a diameter. I reduced the diameter on both my 9 and 45 expander's a bit until I had no setback after 6-8 loadings from slide lock with a dummy round.

January 30, 2010, 08:54 AM	#2
Cloudpeak Senior Member Join Date: March 25, 2005 Location: Wyoming Posts: 288	I taper crimp my 9's to .375". I'm sure you know, but some reading this thread might not. In pistol cartridges that headspace on the case mouth, you use the taper crimp to remove the case mouth bell and you don't roll crimp as you do on revolvers. IMO, you derive little to no bullet holding capability from taper crimping. You taper crimp so the ammo will feed and chamber properly. I always check for setback when first setting up. If there's a setback problem, it's caused by the sizer not sizing enough or the case mouth expander being to large of a diameter. I reduced the diameter on both my 9 and 45 expander's a bit until I had no setback after 6-8 loadings from slide lock with a dummy round. __________________ Cloudpeak