I am sure there is someone who may have tried it, if they frequent this site who knows. I honestly think buying a pound and trying it may be your best option.
When I first got into LR shooting, I was introduced to Norma powders, something I never would have tried before. MRP & MRP2 were staples, also did some URP in a 6.5x47 and 203B in a 6BR. When Norma pulled the plug on MRP2 over costs, here came 217. I just want to say anything myself and friends tried it in was a disappointment, of coarse 338 LM was not one. Not sure if our expectations were too high, or the actual burn rate published was not close. 7 saum, 6.5 saum, 7mm Rem mag, and more, it just never seemed to be much slower than MRP, and it just seemed MRP produced more energy if that could make any sense.
So if you've questioned whether MRP would work, I myself, would not put much stock in 217.
Good luck in your quest.