I would suggest:
Defensive Edge brake from Defensive Edge a sponsor here.
Holland QD - Darrel Holland another sponsor here.
308 Nate make quite a pretty one. Again a sponsor here
APS, Allen Precision Shooting makes great ones also - Again a sponsor here.
Jim See (Coyboy here could also do the job) Another sponsor here.
I could go on an on and still miss some. For that I apologize.
I have a Defensive Edge and a Holland QD on a couple of boomers and they are great. I just came in from checking zeros and had no problems spotting shots @ 200 yds with either one shooting prone off of bipod.