In general, sorting by brass maker/headstamp isn't as important with pistol cartridges as it is with rifle. I go to the trouble of sorting .45's just because. For one thing, all one brand are apt to be more consistent as to case length. But for sure I always sort Remington cases out separately. This is because the case walls at the mouth are thinner. This can cause bullet pull/tension issues. So when I was loading cast bullets in .45 ACP, I'd save the Rem. cases for this b/c the cast bullet is .452, not .451 like the jacketed typically are.
By accident, I discovered that the Redding steel .45 ACP sizing die has an inward taper at the mouth to slightly undersize them.
Some reloaders like those small pocket .45 cases. Progressive guys. They might have their rig set up to run 9mm which has small primers. If they want to switch to .45 ACP, they don't have to change the priming fittings on the progressive press if they use the small primer .45's.
By accident, I discovered that the Redding steel .45 ACP sizing die has an inward taper at the mouth to slightly undersize them.
Some reloaders like those small pocket .45 cases. Progressive guys. They might have their rig set up to run 9mm which has small primers. If they want to switch to .45 ACP, they don't have to change the priming fittings on the progressive press if they use the small primer .45's.