Fair comment.

The bit I cant get my head around is whats there to disbelieve?

Holding a rifle well enough to shoot a group like that (with a centrefire) is easy, I can do it and most serious riflemen can also particularly from a bench as Harry did.

So theres no extra special skill in MOA marksmanship

He never professed to hit given targets merely acheived groups anywhere on a piece of paper against a single aim point therefore reading the wind becomes irrelevent as long as its consistent through the shot string and your piece of paper is big enough.

The whole exercise is purely a function of an accurate and consistent rifle, consistent ammunition and consistent wind.

Interestingly people chose to rip Harry apart wheras his actual involvement is possibly the least significant part his equipment and weather would be infinitely more important

Richard