Years ago I was told that stuff about 3" shells in 3"chambers for the fully rifled 12 ga. 870 I use in shotgun zones. Found out by experience that it wasn't true; at least not in my gun. I run 2 & 3/4" Sabots because my barrel is more accurate with them. Not only that but I also discovered that deer can't tell the difference which slug I hit them with. So I just go with accuracy.
