Make sure all your ammo is in spec before you shoot that critical match. One tool lets you check four popular calibers used in Cowboy Action: .357 Magnum, .44-40, .44 Magnum, and .45 Long Colt. Helps you avoid jams, misfires, feeding problems, and other malfunctions caused by out-of-spec ammo that can cost you precious points-or the whole match. Machined aluminum with check holes precision bored using the same high-quality Clymer reamers. Mfg: Egw