I get a huge kick out of everyone talking about increased muzzle blast...
no... they don't increase muzzle blast any more than taking that length off the barrel... if you have a 24" 338 Win Mag with a boss ( I do )... it's not any louder than a 21.5" non boss barreled gun... it doesn't amplify the noise
This is technically true in the sense that the total amount
of noise is unchanged.
HOWEVER, from the point of view of the shooter, more noise is sent backwards and to the sides than a conventional rifle and from the point of view of someone standing beside the shooter it's a LOT louder.
That's a WHOLE LOT louder.