Bought a Ruger Precision 22l for my kids. Put a $20 muzzle brake, 6-24x50,bipod and mono to look like the big gun. After 500rds of good groups I took it off to tighten up the groups but they gained 1/4" at 100yds and 10" gong at 300yds went from hit after hit to every other shot or worst. Put it back on and tight groups returned. Anybody else seen this with a muzzle break on 22l?