I purchased a 870 super mag turkey from gander last year..it has a 21 inch barrel, and came with a rem full turkey choke...It patterns horrible with winch sup #4s...30 yards is hit or miss,,which i found out this past spring... Im looking into finding a better choke/load combo...preferably a cheaper load...federal.rem..winch..area and a better choke...ANY IDEAS? any info is much appretiated....im not very fluient with the whole .655 .665 or whatever sizes better chokes come in.. A HUGE THANKS to any info