Jim from what you describe those barrels are chambered for 45 colt only, probably not a good idea to shoot 410 in them. If they are 45 colt only they are somewhat uncommon (you don't see them for sale often). I would guess who could give you more info on if they are "collectable" is Ron at RJ's Guns (do a search to find it) or Ed K. at Ed's Contenders (advertiser on this form). You know, you can find the old style barrels chambered for 45 / 410 for pretty resonable prices in quite a few places - seems like they pop up on Ebay fairly often. Hope this helps.