When I saw you were shooting .575 I was going to ask how they loaded. I had once purchased a LEE mold for my Renegade in .535 diameter. My old shooting buddy and I casted all day long, drinking lots of beer, and just having fun. I bet we had three hundred ball cast that day. And I loaded two of them and never loaded another one after that. I had to drive them down the bore of my rifle with a large club or ram against a tree. It was a free for all. BUT the good side is, I was into shooting slingshot/a.k.a. wrist rockets at the time. And those .535 ball made the best ammo I ever shot. I could knock a bunny rabbit off his feet with them. We also used wrist rockets when deer hunting kind of.. we'd make drives and shoot them ball into thickets to spook deer out. It really works and we did not have to wander through the briar patches.