The Carlsons can be a real bargin, I found a .660 for my buddies Browning B-80 in a bargin bin in Anchorage for $2.00 and sent it to him. He also has a Jelly Head and an Under Taker, He was working hard to find a load with the last two chokes when I told him to try the bargin bin choke he did and Wow! that thing is wicked in his gun with both Hevi-13 #5's and #6's he has no need to ever look any futher! I also use one in my 20Ga with very good results with Fed HW #7's
Kurt