Doing some old school testing with a 26"bbl Remington 870 barrel on my 870/ Double beads. Has Hastings CT -2/ Tru Choke threads. Shooting Kicks .655, .660, and Hastings non-ported .665. Patterning with the Winchester standard Pb loads in 5's and 6's (HV, Super-X, XX). Barrel has been polished and the action has been cleaned up. I would imagine it will end up with .655 and 6's turning the best hunting pattern.