The scatter guns are just as picky as .22 or center fire weapons as far as shells go. Yesterday we started with Federal 2.75" #8 shot in field loads. My mossey 835 along with about half dozen other guns loved em. Great patterns and tight. Today after about 10 rounds we ran out of Federal and switched to Winchester 2.75" 7 1/2 shot, again field loads. One of our rules is every body shoots the same ammo, and ours only. My gun along with a lot of the others from yesterday puked. Mine an a couple others had problems with extracting also. Chumps from yesterday turned into Champs with the Winchesters. One mans trash is anothers treasure. I won two rounds early with the Federals. Later rounds with the Winchester and I sucked .........