lemoyne
I use the new MMP-HPP .458 orange sabot. When I talked to Del about these sabots he indicated that he aquired the .458 machine from Knight. I order directly from MMP.
http://www.mmpsabots.com/ Because Knight is usually a larger bore than normal I did not think I could load them, but he convinced me to try them.. and to my surprised they loaded in everything I have. I thought me A&H, Remingtonsand Thompson fast twist barrels were tight but they work fine. I just got a new fast twist Hawkin Stainless Steel barrel from Green Mountain - it seems tighter than anything I have right now - I'll find out this weekend. I do notload sabots that are stubborn, with the new polymere's it is not necessary,so I will have to find something that will work.