Yes, Factory ammo is fine. You'll probably find they have 180 grain bullets and the originals were 220. They should work fine. Lots of us here shoot them and one takes his elk yearly with his. Don't use a reduced load as it can buy you a whole different lot of trouble. The serial number doesn't even come close to a hit... Yes, there's a place to find out about trapdoor rifles and carbines on this site.