Well, this weekend I got a chance to try out my new 410 classic upper. I started off with some Remington 2.5" slugs and it ran like a top. After running 25 rounds with no failures to feed or extract. It was a kick in the backside of fun, knocking down tin cans at 64 yards. I then decided to try some Remington #6 2.5" Express Long Range ammo and things changed with the second shot. I experienced my first failure to extract. I clear the jam and ran the balance of the mag with no issues. I loaded up another mag and had one more failure to extract. After 15 rounds I ended up with 3 FTE. I then switched ammo once more. This time I used some Remington Premier Nitro Sporting Clays #8 2.5" ammo. Out of ten rounds I had only 1 FTE. I compared the ammo and the slugs where about 1mm shorter then either the Express Long Range or the Premier Nitro's. Over all I was pretty pleased with the performance. Looks like it really prefers the shorter shells.