If birds are going to be near IC and MOD work well, if mostly longer range 25-35 yards then MOD and FULL. And yes a 28 will kill a dove at 35 yards, neither the shot nor the bird knows or cares what it came out of gauge wise. It's about being able to put shot on target to kill the target. People who think one gauge is good or bad for a task miss the entire point. A gun is a gun it is what you do with it that matters not the guns fault or the bullets fault.