Shooting lead through the power-port is much different than shooting lead thorugh a muzzle break. The S&W M500 original load was designed to shoot CorBon 440 Hard Cast LSWCGC thorugh it. I have shot thousand's through my 629 PP with a 245 and 285gr LSC and never had a problem. I do the same with my TC 44Mag with Hunter brake. Just be sure you clean the gun. I would not shoot swaged lead though; they are very soft.