Seems to work, but there may be better options if you spend time and $ testing - Trulock Boar Blaster Choke Tube

A lot of Money for a small piece of tubular steel...still I figured if it works as promised it's worth it ( still cheaper than the "buck kicker"). I've only tried a couple variations of 00B and one brand of 000B, all at 25 yards, both put all pellets in about 12 inches. ( I was rushed and didn't take time to try at 40 or 50 years)
Bottom line: like everyone has always said, you do need to try a variety of buckshot options to see what really works best. in my experience so far all that I've tried worked adequately. unfortunately at about $1.00 each shot that can add up quickly.
P.S. something else that works really good is simply using Federal ))B with the "Flitecontrol" wad.
must use cylinder bore choke or possibly improved cylinder with these, but they gave an even tighter pattern at 25 years than the boar blaster. ( again , didn't have time to test at 40-50 yards)