Hornady makes both sst and shockwave bullets they are identical,but the sabots are different. The sst uses the hph12 sabot, and the shockwave uses the hph24. The shockwave sabot is thinner and easier to load. Both sabots are considered high pressure black sabots made by MMP sabots.
I shoot the shockwaves with three 777 pellets excellent accuracy,not too hard to load. The encore also likes 100 gr. loose 777or 2 pellets of 777 with the shockwaves. Try any of these loads with the new triple seven primers works great no crud ring.