For deer I’d go with the CM. More than enough for deer at your max distance, cheaper to shoot, easier to find ammo, less recoil, etc
Chronographed (143 gr ELD-X commercial)
6.5 CM (2066 FPS @ 500)
Estimated (143 gr ELD-X commercial)
6.5 PRC (2268 FPS @ 500)
For comparisons…
Chronographed...