Treat them like a cup and core. Hornady data will be a good starting point. They do have quite a long bearing surface, so my guess is you will not quite reach as high a velocity. Heaps of rave reviews online of their performance on game.
I believe the 120gr is made a little softer for Grendels. So those in a PRC up close might be pushing their limits. That said, I've shot roos up close with the 75gr ones out of a 22-250ai (which are usually used by the yanks in short barreled 223's) and even with pretty insane impact speeds they held up no problem.
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