Re: Glock 21 reload question
I have virgin brass that measures .893" and a 20 round sample of once fired and many fires, runs .885" - .894".
I don't trim 45 ACP brass. I load it in a Dillon 650 using Dillon dies, Dillon carbide FL, flare mouth with the Dillon power drop tube, Dillon seater die, and finally the Dillon taper crimp die. Evey round goes through a Dillon Case Gage......checking for overall length, case length, primer seat, case head/base oversize, as well as shaved bullet jackets, split mouths, and/or other adverse conditions.
From a load batch I usually find 3-4% which are a bit out of spec and will separate them. From that 3-4%, about 50% will safely fire in my Kimber Classic. Most of the other 50% are high primers or really short or long cases that go directly from the case gage to the recycle bin. It's an acceptable loss for bulk reloading, for me.
If I were loading for one chamber only, such as the Glock 21, setting the seater and taper crimp die would be quick and easy. Like others, I load for various 45 Auto handguns, and like rifles, the chambers vary, so I set the dies for a happy medium. Probably the most accurate case gage is the specific handgun chamber itself. I check these with each gun I have. I simply remove the barrel and use the actual chamber as the gage. After checking, if the chamber is within what I feel is normal (all my 45's are), then I feel good about using the Dillon Case Gage, which is a bit faster to use and more convenient.
I think there is a lot more acceptable variance with taper crimping and case length in auto loading pistol cartridges.....not as much as roll-crimp rimmed revolver cartridges, but a lot more than bottleneck precision rifle cartridges.
Best Regards.......Eagle Six