6.8 SPC. A short .277 caliber round designed to fit into AR15's. Works just fine for deer with the 85's on up to the 150 PSP's that I have. Roughly the same power factor as a .30-30, but much better trajectory and bullet choices. A little undergunned for elk, but it would do the job.

I have a .280. Works fine, and I consider it equal to my '06 in the same firearm, both Remington 740's. Ammo cost doesn't really bother me too much, as I pretty much reload for everything I have. I need a few dies, but for the most part, I'm set.