If I build a big game hunting rifle that is 1 moa 5 shots all day long, I built it too heavy.
1 moa average 3 shots is as heavy as I want to build them.
But the varmint rifles I would like at .5 moa 5 shots.
Heavy gun, light bullet.
The trouble is, when and where is the wind low enough to test that?
If I get inland away from the ocean a hundred miles, and then find flat country, and then shoot at sun up.
I do go there and do that, but once or twice a year. Near Seattle with ranges opening at noon, i can count on 6 mph gusty winds.
No one, not even really good rifles cleaned every 15 shots, can do 1 moa all day long in that wind.
I know a number of guys that test rifles at 50 yards, to reduce the effect of the wind.