If your rifle is moving up and to the right when fired, it may be one of several issues.
The movement up is likely muzzle jump, and the brake will help with that.
The movement right may be caused by canting or an incorrect sight picture. Try shooting off a steady rest and see if that reduces the movement.
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I ran tests at 25 yards on several rifles to see where the brake had to be angled. It was very clear they had to be tilted right. I shoot right. I sometimes argue with posters here, but I never argue with my rifle.
Here is my SKS peep. Half of a Lee Enfield L sight.
