I hunt almost exclusively w/ an Ithaca Mod. 37 made in Kings Ferry which is threaded for the Browning Invector/Winchester tubes. I've evaluated a bunch of different choke tubes and am sold on the IC .660 w/ Hevi-13, 3",2 oz., 7's and 6's. My barrel has been polished and consistently puts 245-255, 7's and 200-208, 6's in 10" at a measured 40 yards. Since the release of the Hevi-13, 7's, I carry a 7 in the chamber, and two 6's in the magazine.