Ever look into the D-tech cartridges?
I currently have a 25DTI on order. (also available in 6mm, 6.5mm, and a .22 variant)
90 gr bullet @ 3000 FPS would be a damned good goat round and could still handle the Mule deer duty as well. It's basically a 6.8 SPC case necked down and shoulder blown out just a touch. Single pass sizing then fire formed from there and he has the dies in stock. His reputation for accuracy is near legendary in the predator hunting community. He's also one of the only guys out there building reliable WSSM uppers too, but his DTI line IMO is the best of both worlds.
http://www.dtechuppers.com/ar-15-dti...receivers.html
Mike's work is top notch, and he's great to deal with, and his prices are insanely reasonable considering what goes into his builds. only problem is he's backlogged about 6 months right now.

