Myself and2 others tested chokes from several different companies in our3.5" Browning BPS 12 gauges 3 years ago. We tested Winchester, Federal and Nitro ammo. The Rhino chokewas obviously amazing with the Nitro butit also shot the factory stuff better than the other chokes too. Suprisingly enough, the second best performer was a $19.99 choke from WalMart called a Star Dot. I did not test hevishot with my choke as it is a .660 constriction and Nitro recommends a .670 or .685 for hevi-shot. The Rhino is easily the best choke I have ever used. Give them a call at 1-800-226-3613, maybe they will let you send it back if you are not satisfied with the results.