I shoot Widner .500 dia. Pistol bullets in a purple sabot, the Maxies are to long even if you sized them, lead bullets will work if they are the right length for the sabot and sized to fit for that particular sabot the purple sabot takes a .500 thats the only one I use 1 use 270 gr HP the 300 SP and the 350 gr SP they all shoot real well in my System One [1-38 twist] with a 140 gr load of RS. Lee