Yea, I've been shootin' Hornadys factory loads for years in the SST. They have performed awesomely for me.
This Kansas whitetail was taken quartering away with a 139 gr SST at just a few steps past a lasered 500 yards. As with most of the several animals I have shot with the Heavy Mag load from Hornady he went right down. I don't think I have to explain what can easily be seen concerning the bullets performance.
I hated to see them discontinue the Heavy Mag load but other than the lack of the moly coating option, the Superformance should work just fine, maybe even more accurately with their new powder developements. My rifle has accuracy enhancements and the barrel de-resonators help it to shoot great groups with the fast load, but it was a bit more challenging to tame at 3250 fps.
Hornady's ammo is hard to beat and I really appreciate the fact that they are the little guys who bring the most to the table in developing creative loads and calibers.