Typically it's about 50 for rare, 58 for medium and 64 for well-done, so for medium rare, I'd go with 54. Everything over 70 indicates that someone forgot that there was still meat on the parilla
I'm pretty sure the steak you ordered was not at 85 core temperature (assuming you liked it and assuming you don't like to eat leather).
I'm pretty sure the steak you ordered was not at 85 core temperature (assuming you liked it and assuming you don't like to eat leather).