RE: 20 Guage 870 Express
I used a 20 guage 870 when I started out hunting, and I will tell you right now....you can't underestimate the power of one of those guys. My first year turkey hunting, I shot at a turkey running away at 55 yrds, and even with the choke I had in the gun, it set him down! I also used my 20 guage deer hunting, and I shot my first buck with it. The deer was maybe 40 yrds away, but it set him right down! I'd say at 100 yrds you're pushing it with a 12 or 20 guage, but if you make a good shot...I will guarantee the 20 has more power than you'd think!