You can also shoot 44 Spl, 44 Russian and 44 Mag through a 444 but as billy said, you could develop a nasty carbon ring in the chamber. I used to plink with 44 Russians from a earlier Marlin 444 and had a ball with them - had to load them single shot but it was a lot of fun - also had to clean the chamber frequently to avoid ringing the chamber. Mikey.