I've shot a half-dozen chokes (Rhino, Jellyhead, IC, etc.) through my 870 Supermag, and the Patternmaster Code Black by far patterned the best. Inside a 20" circle at 40 yards, I get 90% plus patterns with TSS and Hevishot. Kinda expensive (around $100) but when I have a strutter in my sights, the cost is irrlevant.