45 Colt. I loaded the cartridges in the picture below. 200 grain Speer #4477 jacketed hollow points (flying ashtrays) over 10.6 grains of W231. These loads were used on hogs with devastating results. The bad news is that Speer discontinued the 4477 bullet. The new Speer 4478 Gold Dot bullet would be a good replacement for the 4477. These loads are for use in modern strong firearms like the Ruger Super Blackhawk, T/C Contender, Marlin lever action rifle, Winchester Trapper.