The details. High end AR-47, Warne single mount base mounting Vortex VHS 4307. Sub MOA at 100 yards. (At the end of the story) First shot at 50 yards, next county over. Dial in way right, way up. shoot. Not on paper. Multiple rounds later, scope was at max right, max up, and shooting over 1 foot low and at least 2 feet left. The spotter in the group suggested the only possibility was the full forward venting muzzle brake. Removed, and reset scope to zero. 5 shots later, 3 rounds, one jagged hole at 100 yards. I am still flabbergasted. Had a can been on the end, it could not have resulted in anything less than multiple baffle strikes and a side exit. How in the world can a muzzle brake be THAT BAD on POI? Needless to say, now looking for a new muzzle brake.