It’s a pain in the ass, if reloading isn’t an option and feeding other quality ammo in a quality barrel isn’t getting you the results you need, you can tamper with barrel harmonics by doing a couple things.
1. Do NOT excessively torque your muzzle device. This makes the barrel stretch when the barrel is heated after a few rounds and will scatter groups.
2.You can tune your muzzle device. Shoot a group and rotate it shoot another group. Record best group and use a high temp loctite and some clocking washers to set it in place.
3 this is the most tedious tip but can and will change harmonics. Originally torque your barrel but to 40 ft pounds, shoot a 5 shot group and let the barre cool. Tighten the barrel but 5 foot pounds and group again and cool. You’re groups will shrink and eventually get larger. Return barrel but torque to the best grouping.
Good luck!
