BHB I am shooting a 3" gun and the choke is one of the First run of the Mad MAX ( .655)chokes by the Durry Boys. I am also doing 190 + hits with my Winchester Super X-2 and the Rhino .670 shooting both the 2 1/4 oz new Hevi and Winchester Ex-Range shells.
Here is what my X-2 is doing at 43 yds. No need to buy the NITRO's even though I have a box of 20...