The only "Flip" which will affect where the shot hits is that which occurs before the shot leaves the bbl. You can turn the thang around after the shot leaves the bbl but it won't hit behind you.
The "Flip" which Burrard discussed was not the rise from recoil. It rather was a downard flexing of the muzzles which occured as a result of the inertia of the muzles trying to stay stationary as the gun rose in recoil. This would offset to some extent the recoil rise causing the gun to hit lower than it otherwise would. This flip, flexing or bending of the bbl (Call it what you will) is a different thing than recoil rise.
Recoil rise is quite prevelent in short bbl guns such as handguns. Bore sight a pistol which is properly sighted in & you will invaribly find the bore axis is point "Below" where the shot is going to hit.
The longer & less rigid a bbl the more it will be affected by Flip. I do believe this is what Larry was seaking of, not recoil movement. That part of the recoil movement which occurs prior to the shot leaving the bbl is of course why the bbls of a double converge.
