I've only been doing the ML thing for a short period of time, but I don't think I would put anything in front of the bullet. I would assume if you put a sabot in front of a bullet, you would want to put the flat side facing the front of the bullet. If it were done the other way, I would think that would be very dangerous. It seems very possible that the "wings", "tabs" or whatever you call them that fit over the bullet normally, could get wedged inbeween the front of the bullet and the barrel. I don't know for sure, but it makes sense that that might very well cause major increased friction and would not be a good thing.