I never minded humping mountains with heavy long barrel rifles. Like 28, 29, and 30 inch. Heavy rifles dampen recoil and allow for stable shooting platform. Some of my rifles have the taller bipods that give you time to sit down and really place your shots.
I went from using a 30-378 30 inch for years to a 338 LM 30 inch. The Lapua can launch a 245 grain faster than a 30 cal using 245's. It's just physics. 60,000 psi pushing on a the larger area base of .338 cal. Down range as the yards add up you would have to look at ballistic charts and compare bullet BC and starting velocity.
They have online bullet energy calculators. The 338 LM can take on anything in Alaska!