the .750 brakes are on the back burner for the larger calibers. Production on the.885 has us swamped but addition of a new machine we hope will kick us into getting caught up. We will be doing the 9/16x32 TPI for the larger 6mm, 6.5,7mm, and 30 cal as the 1/2 inch stuff can be suspect on crown expansion on some various hot calibers in those lines. You having the .660 Barrel od would be a perfect fit for this. These will be offered in a smooth line brake or gun smithed version if you will. hope to get caught up in the first few weeks in the new year.