I was fooling around with PRB in my TC Hawken today and found that if I use an over powder wad I can go up to 75 grains of Black MZ with very good accuracy at 50 yards. My vision doesn't permit me to really see what I could possibly do with the load at 100, so lets assume the farthest shot I might take with this load is 75 yards (and most likely would be insider 50). I believe the ball is doing about 1500 FPS out of the muzzle. Enough for deer? I would be looking at white tails, mostly.