kix,
Funny you should mention that, "one shot in the field". I fired my rifle with the BOSS on it ONCE at an elk in the field. Hit my target. No problem. Dead elk, successful hunt, right?
Mine's a 338 Win mag. The reason I mention this is the brake works on the amount of muzzle pressure, the more muzzle pressure, the more efficiently the brake works, and the more "blast" you get. I'm not saying a 30-06 wouldn't be LOUD, but less so than the 338 win mag.
Well the best way I can describe it is it felt like I had been jammed in both ear drums with an ice pick. I do NOT exaggerate. I could hear NOTHING for the rest of the day, and only a little bit the next day. My ears RANG for the rest of the weekend. I got my elk, sure, but the effects of the brake on my ears effectively ruined my hunting trip experience.
I vowed NEVER AGAIN to shoot that gun with the brake on it.