I think the recoil system is a major factor in recoil reduction. A similar load in one of my doubles, kicks like a mule, the 600 does not.
I don't think the muzzle brake does much at lower velocities. It takes "high speed" gases to make it function.
If you're going for something special, go for bigger than 458 Lott. I'd suggest " a Lott bigger".
I'm in charge of controlling all the Elephant, Rhino, and Buffalo populations here in central Wisconsin. So far I've been doing pretty good.