It's really similar to the 6.5-06 Ackley or the .264 Win Mag. A little more capacity than the '06 and a pinch less than the WM. All three are excellent choices for deer hunting with the appropriate bullet selection.
If making a custom 6.5 RPM, work on the bullet selection first then create your throat and freebore before picking a reamer if necessary. Or thr standard SAAMI reamer can be used with a throating reamer. Ask your gunsmith.
I'm using the Hornady 135 gr. A-Tips for deer and elk but I'm trying out the 153 gr. A-Tip on elk also. The Woodleigh 160 gr. Protected Point (80A) gets a supportive vote for elk.
The lighter bullets 130 gr or the 135 gr. work extremely well.
Enjoy the search!