Check with Leadheads for hardcast 230gr .452" bullets.......the website is Proshootpro.com, & like the other gent said, since you probably will not have a full-auto version, I wouldn't think they'd pose a problem, but I have to admit, altho I'd LOVE to own one, I never have. Did rent one, tho, at Buffalo Rock Shooter's Supply in Ottawa, Illinois, back in the late '70's. $7 for a 20rnd stick mag. Just like sprayin' a water hose! Great fun! jd45