pump action shotguns -- which one(s) of these come with a shortish (under 22") fully-rifled barrel, and are considered to be above-average or excellent in the accuracy department? Thanks very much. If they're all about the same, then it'll just be the 870 for me, which is a fine gun, but if something stands out head and shoulders above the 870 in accuracy, then I want to run with that. Is the Ithaca Deerslayer clearly superior to the 870? Others?