I have no personal experience with the 162 AMAX bullet although I shoot .280 Remington a lot.
After sending you to the ramshot website I went up to my loading library and pulled out the Second Edition of Modern Reloading by Richard Lee.
He shows max loads as follows:
H1000 60 gr 2711 fps
H414 47.5 gr 2669
H4831 54.5 gr 2644
H4350 49.5 gr 2614
Hodgen's reloading manual lists comparable data.
If Ramshot can do what they claim they can do then their Magnum powder just might be the right stuff.
Again- I have not ever loaded with Ramshot powder. They are gaining a much larger profile since their acquisition by Western.
I think I might try some- with some Hornady 162 gr AMAX's