Check the case length!

[Jim]

I learned to check case length (http://fgsp.wordpress.com/2010/12/11/check-the-case-length/) on straight wall pistol cases.

[geargnasher]

Yes. I have to trim my .45 Colt brass every three reloadings or the mouths start to get uneven/crooked. That's at SAA pressures. The only ones I never trim are .45 ACP or .40 S&W, if they need a trim they are ready for the scrap bucket.

Gear

[John Boy]

Jim, I rooted through a tobacco can of mixed 45 Colts and found 6 of them. Each case was 1.285". Every case in the can was rotary tumbler cleaned and resized.
Bad lot of brass maybe?

[Wayne Smith]

Not just straight pistol cases. Anything that gets crimped. I've got a hundred 32-20 cases that are all over the place, very few the same length. Got to get out the trimmer.