I'm not familiar with the Lee Enfield and would have to see this phenomenon for myself to accept that any shot group could be tighter at distance than it is at closer ranges... But I do agree that MOA at distance is far more than simple geometry.
Theoretically, given perfect conditions, consistent trigger pull, consistent POA, and a consistent shooter, any rifle is mechanically capable achieving the MOA geometry out to the limits of its cartridge performance but both nature and the human condition have a knack for disrupting consistency.
The target I posted above is good example of this.
I post at 100, 200, and 300 with this rifle and I know that regardless of the what the wind flags are doing, I can consistently put rounds inside the 1" bull at 200 yards because the 62 Grain Federal green tips I'm shooting have the mass and speed to overcome outside factors at this distance.
...theoretically, I should be able to engage the 300 hard target and deliver "sub" 2" groups... And actually did "once"... But the conditions were perfect and I was on my game.
A five to ten mph cross breeze acting on a 62 gr round at 300 can wreak havoc on a shot group.
Originally Posted by TLuker
The problem with all that is it's theory which is why I never mentioned it. Theoretically a rifle that shoots 1MOA will shoot about 1" groups at 100 yards and 2" groups at 200 yards, but again that is in theory. The problem is there are a lot more variables when actually shooting at different distances. Your scope or iron sights might hit on a bullseye or deer perfectly at 100 yards and allow you to shoot great groups. At 200 yards your cross hairs or front sight might completely cover a target and your groups will really open up as result because you are no longer aiming for a specific spot.
I'm bringing this up because far to many people assume they can shoot 3" groups at 300 yards because they can shoot 1" groups at 100 yards. The two are not the same and the only way anyone can know what size groups they shoot at 300 yards is to shot groups at 300 yards.
In addition barrel harmonics are also a factor. It is actually possible for a rifle to shoot tighter groups at a distance than up close. Lee Enfields are famous for that. Barrel twist and bullet weight are also important. A barrel might shoot great groups up close but the bullet can become unstable at a distance because it doesn't have enough spin. Plus there is wind and so on.
Again, the only way anyone can know what their gun will shoot at different distance is to shoot at those distances.