Funny how that phenomenon doesn't apply to suppressed rifles.....
I'd say it does, but may not be as noticeable.
Anything suppressed generally has a big heavy barrel. If anything, the weight of the suppressor dampens the barrel harmonics. A friend just put one on an AR chambered in .260. It shot 1 1/4" groups without the suppressor and One-Holes with the suppressor.
Most suppressed barrels are heavy axle rods in the first place.
