1. It's a stainless steel barrel.
2. The recoil doesn't seem too bad to me. In the Encore, I'd say worse than a 30/06 but not as bad as with the muzzle loader barrel or 12 gauge shotgun barrel. You need a scope with good eye relief though as the design of the buttstock lends itself to significant scope bites.
3. If you try to push a belted cartridge straight in to an Encore, the belt will hang up on the ejector. If you turn the cartridge a little clockwise when the belt contacts the ejector, the cartridge will go right in.