In virtually all cases of factory purpose-made .300 Blackout barrels and factory ammo, there is no problem with baffle strikes or bullet stability in .300 Blackout. Whenever trying a new subsonic load (or any load you think might have stability problems in your barrel), an easy way to test stability is to put a piece of cardboard at 50 or 100 yards. With the suppressor removed, shoot 50 rounds at the cardboard. Then check to make sure you have exactly 50 perfectly round holes. A keyhole impact or a missing hole indicates a stability problem.