Depends on your equipment (loader). H110 has been a powder used forever and a lot of folks like it. I have been told if you are using a progressive press like Dillon the fine flake H110 gets messy when dispensing into the case and goes all over the place. IMR 4227 is coarser and gives similar load data and not so loose on your loading bench. Your biggest challenge is finding powder anywhere. Hang in there and keep looking and eventually you\’ll score. I have several carbines and they are all fun to shoot. Good luck