Since i've got my juvenile joking outta the way, i'll attempt a more serious response....
I think you're spot on having a 1-gun battery - though if resources allow, it's also nice to have the 'just-right-cartridge' for each game/range intended.
As some of the more knowlegeable shooters have recommended, i'd also suggest a mono-metal bullet. I'd look first at the Barnes "Tipped TSX" in a medium-for-caliber weight. Thinking the 168gr or 180gr loaded lite would do the job for you.
Tipped TSX Bullet | Barnes Bullets
Maybe ask Barnes what minimum velocities are required for expansion on these so you can calc what distance/velocity/powder charge you will need (and balancing it all with an accurate load) to achieve that.
My reasoning is *hopefully* consistent with your good idea with down-loading your RUM to prolong barrel-life and allowing you to reach effective expansion velocity without over-expansion/pelt-damage.
I believe the comments other posters have made RE: the resiliency of the yotes so the Barnes Tipped TSX could very well provide that nice balance.