One of the reasons I ask is because I usually rest my gun on sandbags to sight it in, and grip the gun lightly, or not at all on the front. Other guys, I observe actually wrap their fingers over the top of the barrel to prevent muzzle jump. I'd have thought that would throw things off. Me, I don't care how much it jumps, as long as the scope doesn't catch me in the eye. But, I wonder if the restraint, or lack of restraint of muzzle rize changes the strike point. Bending the barrel down with finger pressure definately throws the whole thing off. You'd never shoot offhand that way.