IMHO experience 45 (long) Colt chambers and throats as well as loading dies can vary a great deal. My only current one is a New Service Match Target from 1926 that is a great gun. I use a Lee 4 die set (also carbide) and since only one gun is involved, only size down to where I get good bullet retention (only shoot cast). As this revolver is an almost handmade gun, I have no chamber variance, so any case fired in any one fits every one.

I shoot moderate loads but with 300 gr bullets and have never had a problem with bullets sliding out, given a good roll crimp in the crimping groove.

Cases last forever. I'm still using some that I bought with my first New Service in 1963 !

Good shooting !

[Linked Image]