I had a 14 inch hunter 30-30 and came to dislike the break, not because of the noise, but because when rested against the side to a tree, the shower of bark that came off the tree was pretty disturbing. I had the Muzzle tamer cut off and it left the barrel at 12.5 inches and it balanced nicer without a rest and no more bark flying. I don't think the velocity loss is significant. If you like 12 inches I'd go with it.
regards,
Graycg