6.5 PRC is an awesome choice. Plenty of great options for boxed ammo. If you go the handload way, the brass is readily available from Peterson, ADG and Lapua.
Here is a comparison between my former 280AI Hand-loads 20 inch barrel and factory Hornady Hunter Ammo 143eldx 24 inch barrel. As you can see it maintains 1500 ft lbs out to 700 yrds ( at 7200 ft above sea level 50° day)
I believe these are pretty modest numbers, compared to what you can get out of it handloading.
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