In your first post you said that the loads are very similar and asked what is the differance. I replied that the 10 guage has more killing power than a 12 guage. I agree with you that they are very similar. I am a waterfowl guide here and I hunt most days of the week. I shoot the guns I shoot because of their reliability. Yes, they are expensive guns, but they have never let me down. We spend a lot of money every year to give our clients the best hunt possible, that is why they come back year after year. I do know a little about the subject. I just gave you my opionion on the 10 guage that is what you asked for. I never said the 12 guage was not effective. I have shoot a 12 guage for a number of years. I just prefer the 10 because it has far less recoil than a 12 guage. The shells are just about the same price as the 12 3 1/2's where I buy mine as well. I am not argueing with you, and I am not saying that I am right, I just gave you my opinion on your question.