I have a muzzle loader that my grandfather gave me that only says Armi Jager Italy on it. My grandfather says it shoots a .58 caliber bullet, is there different diameters for this or can I just buy them in a gun shop? Do they have to be round balls or can I use a bullet? I have .50 caliber round balls, can I shoot those out of it? Also, what kind of primers does it use? Four wing musket primers?