Grouse, and others, about the boat tail, as I look at the bullets it is difficult to tell if the base of the 250 LH is any smaller than the heavily radiased coyote bullet (sst). I think any sabot that worked well with them coyote bullets will work egualy well with them LH's. Them 300s look good, you might try a very light knurl on the LHs to get them to grab the sabot better, I have not had as good accreacy from bullets with lube grooves, I know the groves aren't for lube on the 300 but they are basicly the same as a Cast Bullet with grooves. just a very light roll between 2 files will do it. Just so it grabes the sabot btter, to hold the twist of the rifling.