600gr thats alot of lead to push that fast. as I have said on my few post I love recoil but even I at 295lbs. have my limits.
My 45-70G lever gun 18.5 barrel (ported) with Garretts 540 grain 1600fps rounds are enough recoil (Chamber Presure) for any lever gun. I guarntee they will get the job done.
My point is as bullet wieght goes up fps can go down and still alow you to get more done, 2000 fps for 600gr 510 kodiak weight retetion will become a real problom when any heavy boned animal is the game, and weight retention is the key to deep penetration and quick kills, the responsibility of any sportsman.
You could mill a mold or go to www.Mountainmolds.com they will build you just about any mold for any cal. and weight bullet.

Reciol Builds Character !!!