Not a fair comparison.Service Rifle shooters use 4.5X scopes and haven't seen a difference in group size in MOA.
Right. But, many service rifle shooters are new to the sport.Not a fair comparison.
OP is not a competitive shooter...
Exactly. You just proved my point. The group will be smaller if he shoots 1/2" at 50.No.
If he shoots 1/2" groups at 50 yards, it would have been a 1" group at one hundred.
After it leaves the barrel the bullet is unaffected by any thing the shooter did.
I respectfully disagree.Right. But, many service rifle shooters are new to the sport.
From my own experience, the difference between 1 1/2 and 1/2 MOA groups is not the difference in magnification regardless of level of expertise.
Actually, for beginners, the high mag may actually produce larger groups due to trying to hold harder.
If you are used to shooting with a light grip on the gun, try a very firm grip holding the gun down in your bags. All the moving parts of an AR need to be constrained.I don't shoot off a bi-pod. I either use a Wichita front rest or a bull bag and a protector rear bag. For the AR, I actually prefer the bull bag.