http://www.thetruthaboutguns.com/2015/06/tyler-kee/silencers-are-neighborly/ This anecdotal tail is quite insightful. Thankfully I do not live in the same area as the author, but I can certainly see why your neighbors may not enjoy the sound of gun fire for extended periods of time. I wouldn't really appreciate a sustained period of a neighbors gun fire for an extended period of time. A firearm is still pretty loud with a sound suppressor, especially if you are shooting standard supersonic loads. However, it is not deafening. And the report should not disturb your neighbors. Be a good neighbor. Open your NFA trust. Acquire a sound suppressor.
Life in the East, I suppose. I've always been a Western boy. Except for my time in the Navy, I've always been close to good shooting places, out where no-one cares about it. Even at that, I've never understood high volume shooting, except for foolin' around with my .22's, back when ammo was available. To me, suppressors have always seemed to be a bit kooky. They make the rifle twice as long and 3 times heavier.
Living in Wyoming, i don't have a problem finding a place to shoot. No one complains or gets their panties in a bunch.In more populated areas, I can see where having a sound suppressor would be beneficial to both the shooter, and their neighbors.
I suppose you'll be using a .300 Win. Mag. for that. Now, how to design a suppressor that is also a brake?
Eh, you can't. The two designs are exclusive. If the suppressor is operating like a break, then it is spitting gas, and it is going to be louder than a straight suppressor.