My experience with 30 carbine was that the cases needed to be trimmed after about 2 reloadings. Sizing stretches them enough that they no longer chamber, in a carbine or a Blackhawk. That was with an RCBS die. Especially fun in the Blackhawk as I wondered why the cylinder bound up and would not turn - rounds too long and they were dragging on the frame.
My source of brass was buying ammo and saving the cases, although that was some years ago. I bought some brass at a gun show (long time ago), and it was pretty bad. The primer pockets were loose and shallow so I trashed the lot. I do not remember the brand, but it was nickel plated.
Lee
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