I have used a 20ga. Remington 870 for over 20 years and find it a great gun for partridge. Since I shoot the majority of my birds on the wing over my English Springer spaniel, I use the 24" deer barrel for maximum spread. Also works great on woodcocks. Doesn't hurt the barrel one bit and it still drives slugs like a tac. Once they get out 20 yards however..BIG trouble reaching them. When that situation occurs, I stick on the 28" mod and go get them. I use it with 71/2 shot or trap load for max. pellets. Doesn't take much to bring down a grouse and once he is down, old reliable will find him and bring him back.