The 300 grain Missouri truncated cone flatpoint Hitek bullet feeds well in the Henry lever. You can get 400 bullets for 65$. I haven't shot a deer yet with one but they do significant damage to a rabbit. They will penetrate 6 (one) gallon jugs of water and 2 pieces of plywood and keep right on trucking. Good powders are W231, AA#2 and Titegroup. These fast powders will burn up by end of barrel with subsonic loads and be very quiet. Just be aware when working with too light of loads of fast powder that you can stick a bullet in the bore. The Missouri bullets will easily push out with a cleaning rod. Keep your charges just under 1100 fps. I aim for 1050 to 1070. This will still be a potent load with a 300 grain bullet out to 100 yards. Remember that John Linebaugh shot a lot of big game with a 250 grain at 900 fps. A 300 grain at 1050 will hit with authority.