RE: Am I expecting too much
Kind of depends on what it is and what I'm doing with it.
For a muzzleloader, I'm happy with 2 1/2" at 100 yards. It's really the first shot from a clean cold barrel that counts, so it's essentially a one shot group. Might come out a week later with a clean gun and see where the next first shot hits. I don't shoot at 300 yards, but the 200 yard group will be around 6".
For a big game rifle, it's got to shoot MOA - at least for three shots - and not wander its point of impact over different temperature, humidity, and altitude conditions. I sometimes take some pretty long shots (under ideal conditions only, of course) - and need this level of confidence in the rifle. I really like them to shoot 3" at 500 yards . . . .
For a varmint gun, its .5 MOA. -for five shots.Samestable point of impact requirement.
Different types of competition guns vary from one-hole to MOA.