Interesting. I have some of the cheap Kight 310 gr. w/black sabots. They are so hard to load, I won't use them. Naturally the package does not give the diameters of bullet or sabot. I measured the bullet at .452. I then measured a pistol round (230 gr 44cal) at .433. When I dropped the pistol round into the Knight sabot it's a nice easy fit. I'm definitely going to give them a try. I know the risk of the bullet leaving the sabot and becomming an obstruction. Any idea how I can determine which of the black sabots I'm using?