The Shock Waves come with the MMP HPH 24 which is thinner the SST which is supposed to be the same bullet has come with both at different times I believe the older ones had 12's and I have heard the new ones have the 24.
I suggest you register and sign on to the Modern Muzzloaderforum and look at what they call the stickies there, there is one that lays out the different sabots with different bullets and gives you all the dimensions. Lee