Big open subject.

Accuracy is relative to what is being hunting and how it's being hunted.

When I use my bamboo/fiberglass long bow and wood arrows, I think 8" at 30 yards is good for me.

When I hunt with a revolver I consider 2" at 25 yards and 8" at 100 yards OK.

When I use a flintlock rifle I consider 4" at 100 to be fine.

When I use any modern rifle, on probably 95% of all game I hunt I love it when I get sub-MOA (which I do in many cases) but I have to admit that if I have a bullet/ammo/rifle combination that gives me 2 MOA, that's probably about all I can truthfully use.

I cannot hold better than 2 MOA on demand anymore with anything once I have no bench-rest. I can shoot 1-1/2" now and then, but not on demand, and I can only do that from a prone position which I only get to use maybe 1 time in 4 when I am hunting.

A man that can shoot 3" at 100 yards from sitting every time will nearly always out kill any man that can hold 1/2" at 100 yards, but only shoots from a bench.

Most shooters that think they are good because they can shoot small groups with a bench rest cannot hit a soda can more then one time in 8 at 200 yards from any position, when you take their bench away from them.