JJ:
It's fired from a .45 platform, but with an aftermarket, .400 Cor-Bon barrel. I've reloaded and shot five or six thousand rounds of .400 Cor-bon through my Glock 21. (Note: .400 Cor-Bon won't feed through Glock 21 hi-caps; you have to use the 10-rounders).
I also have a 70 Series Gold cup outfitted with a .400 Cor-Bon barrel.
It's accurate, hotter than a .40 caliber, an fun to shoot. If you reload, I'd recommend that you cannelure your bullets, in order to avoid bullet setback.
Both my Glock and my Colt have threaded, compensated, Accu-Match barrels.
BTW, I use only virgin .45 Super Starline brass, which I form by running it through my .400 Cor-Bon sizing die. The .45 Super sports the thickest brass that you can buy for forming .400 Cor-Bon.
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Shoot to kill; they'll stop when they're dead!
[This message has been edited by WalterGAII (edited February 19, 2000).]