I did a lot of looking and reading about chokes and i bought one of the non ported 565 from Trulock .. That way i wasn't just looking at what was best for the Federal P. heavy weight 6 or 7 all the time.. i wanted a setup that put up good numbers with the different shells like the 3in. 20 ga. 1 5/16 oz. 6 shot or the federal lead turkey thug 20 ga. 3 in 1 1/2 oz. 5 shot ..you can only find these from WalMart..it's a good shell in a lead without the F C Wad... My gun is 870 youth with sure shock stock , see thru saddle mount with a simmons pro diamond scope 1.5 - 5 -32 mm