I just got back from my muzz hunt. I had 5 deer inside 30 yards and 7 at 200+. Im thinking of 1-4or5x or a 2-7. Dont need any magnification at 20 yards. In the bush or a running deer needs no mag. 5 or 7x should be good as far as you care to take a poke with a BP 50cal.
I shot 2 deer @ 10 and 15 yards 5 minutes apart. I was at my lowest, 3.5X, it was almost too much.
moses