Getting closer to Coues ain't always an option... or not a very good one at that. Can't fathom anyone who's never hunted them during an Oct AZ rifle hunt, or maybe even never been in the country he's likely to be hunting, musing about the ethics of shooting them at long range.
THAT said, back to the original question...
264 WM with 140 VLDs or AMAX is a tough combo to beat, delivering high BC bullets at high velocity with minimal recoil. I've had one or more since '02, and have since sold every 7mm mag and 300 in the safe. A buddy followed suit and last year got one, practiced all summer, and shot his buck at 672. To gain a notable increase in performance, you realistically have to belly up to the big 338s. That's a big jump.
Last couple of years, I've hunted Coues with a 22" 260, 140 AMAX. It's a good bit shorter and handier than the 264, and gets me to the 600 yard line with ease. And I've found that in most of the areas I hunt, I can get within 600.
