yup nice and big rounds, recoil might break your wrist if you don't know how to shoot a gun, but those anime girls with their deinty wrists and boney arms always manage to fire this large calibre ammo like it's going out of fashion hehehe :) what ya reckon it is .60cal? maybe .70 :) there is actually a similar pistol in production today but it chambers 3 20 guage shotgun shells. hehehe wouldn't like to be on the receiving end of that lot :)