They'll work on deer for sure--but that's the bullet Eileen uses for elk in her custom .308 Winchester. It works very well on wapiti--and if she ever decided to go back to Africa would be her choice.

The load uses IMR4895, which while not billed as temperature-resistant, in my experience is far better than RL-15.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck