My pardner uses 2230 and 2200, but I bet 322 would work good too. Don't listen to everybody's nonsense about bullets, your rifle may like something else. I recommend trying different bullets and find out for yourself. I decide by my intended use and range. Since a .204 is only used as a varmint gun, and only varmint bullets are made for it, I would shoot the most accurate, as they are all going to be fast and explosive. Good luck finding powder.