It all depends on how you intend to employ your firearm. Are you going to shoot skeet, do some grouse hunting, waterfowl hunting, or even deer hunting. I personally run 2.75 for skeet, grouse, rabbits and even large sharptail grouse the 2.75 shells work great. For waterfowl, ducks specifically I preferred a 3" no#3 load and for geese I used a BB 3.5 load. Noticed I said preferred. Last season our group hunted along side a couple more experienced and aged waterfowl hunters. One guy used a 2.75 chambered O/U and was knockin' em' down. He swears by #4 steel for ducks and BB tungsten loads for geese all 2.75" shells. I tried a couple of his federal #4 steel shells for sh#ts and giggles and knocked down 2 mallards for 2 shots. I intend to try out a couple boxes this season. For half the price of the other brands I use it can't hurt to try. I hope that helped.