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I'm thinking that the angle of the cut of the butt on a stock can make a difference on muzzle jump.
Again I'm not worried about felt recoil, just if there is any affect on muzzle jump, even with a brake.
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It's not the angle of the butt, it's the relationship between the point of contact of the shoulder, and the axis of the bore line.
If your shoulder contacts the stock directly inline with the bore, the muzzle will NOT rise a bit.
can hold the muzzle down by venting a large part of the gas out the top. Many are designed this way.