It's MORE than enough! I use RST, 7/8oz of #5's at 1125 fps out if my 1923 LC Smith. My barrels are 26" with tightly choked IC/Mod barrels. It crushes pheasants. Here's a limit of late season SD roosters that didn't like that load too much. He Winchester loads will be hotter yet, so have no fear. They will work very well!