I am new to the forum and I know if anybody can answer my question you guys can. I just bought a new Winchester Model 70 300 ultra mag and I am going to have a muzzlebreak put on it. I was wondering if a muzzlebreak would affect the ballistics at all. Thanks for your Help.

You won't see any significant change in ballistics but the noise factor will rise dramatically.

Ditto what stubblejumper says.

KC

Wear sufficient ear protection, and you will be alright. Good luck.

Thanks for the info.