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I had a custom tube made for my mossberg 535ats. Its a .650 (4xtra full). I told him I wanted the tightest patterns I could get at 45-50yards with #4-#6 shot. The guy tests everything and gaurentees his work. I rarely use 3.5" shells. Have switched to 7/8oz # 6 hard chilled lead over 18.2 grains of promo. Wilson precision made my choke. He will make any choke for any gun. Even .625s for card shooting with 12ga. He no longer ships to canada though