45 ACP = IMI
41 Action Express = IMI (utterly unable to wear it out)
9x21 = GFL
38 Super = Remington nickeled
357 Magnum = hmmmm, Winchester
41/44/45 Colt = Remington (only because its thin walls allow more room -- KABOOM!); in fact I prefer R-P cases for much development work simply because they show pressure signs sooner.....
45 Colt = Federal (see they're finally offering it as a component)
I currently use lots.........