rks1949
Hornady SST's are normally supplied with MMP HPH-12 sabots, these are the thicker sabot and do load very hard in most rifles, not all but most. Thompson Center Shockwaves (same bullet as SST's with a different colored tip were coming with MMP HPH-24's sabots) The HPH-24's load in the tight bores of the TC's very well. The Shockwaves are now coming with a new MMP - yellow sabot made exclusivly for Thompson Center. Us mere mortals can not buy that one. MMP also make make one sabot that is even thinner than the 24. There are some guns out there that not even the 24 will load in so Del developed the 3 petal EZ load sabot. In my tests with it it does seem to shoot a better than the "crush rib" - greater velocity and consistent accuracy.
Hope some of this helps...