Not much I can add to this thread. But I was working on a 410 this week and I can tell you it puckered me a bit. I had the barrels supported on each end with soft wood blocks in a pressbrake and was pushing down on them in the middle enough to curve them an amazing amount just to bend them about .010" on this lil' Italian sxs that I have more pesos in than I'd like to admit.Lots of spring-back in those barrels. I was taking out a slight upward bend they had which caused me to shoot this gun consistently high. If I've learned anything from shooting 410, it's the gun fit is critical, moreso than a 12g.