Re: .280 mountain rifle. can I reasonalbly push the 168gr berger?
Bullet length for the AMAX is 1.42". Me giving you a COAL won't do much, you'll want to work that out according to your mag and throat constraints.
I'm using 57.5gr of 7828ssc and CCI 200s. I could probably bump it up a skosh, but it does around 2820fps from my 22" barrel, so that's fine for me. Work up to that, its likely above max.
I've since kind of given that rifle to my sister to hunt with, but I still take it out and shoot it hard. Have fun with yours, it's a great cartridge in a great rifle.