2" at 50 yards is some very fine shooting - many guns and most shooters are not capable of that.
My criteria is that whatever distance I can hit a 9" pie plate every time, under field conditions, is the farthest distance that I'll shoot at deer.
+1 on that. An IDPA target turned sideways looks an awful lot like the body of a deer (it is an 8" circle, but we don't need to be picky). The nice thing about the IDPA target is it does not have a defined aiming point like a most range targets do.
I also have some steel 8" targets I shoot at. On the cheap, 9" paper plates work very well. If I can hit it nearly every time, I consider myself within range of a deer sized critter. Obviously, the range varies depending on position. Standing off hand might be 50 yards; rested over a tree branch might be 75 yards, etc.
