I think the 6CM and 6.5PRC have
very different reasons for being good cartridges.
Just my 2 cents ~
The 6.5PRC is going to shine for hunting larger or further animals, especially when looking for 7mag type performance in a ultra light mountain gun where recoils is an issue. Yes you could stretch it into some of the longer range field matches as a great choice. But, not really the best choice for your high round count PRS matches, it does recoil more than the standard 6.5 and fits less in a mag. The 6CM will shine in PRS type matches when you want,
a hair less than 6.5 recoil but a bit flatter shooter and maybe plan on smaller game, closer. But your really going to cut your barrel life down compared to the 6.5CM.
I do not have the 6.5PRC, but did a 6.5SAUM and several 7s along with 6.5s and a 6CM. Of those, when run hot 3100+ for the 7mm/6.5saum/6CM and the 6.5CM with 123s @ 3000+, only the 6.5 seems to not make me worry about the barrels. I've lost 7mm, 6.5SAUM barrels as low as 900 rounds and a 6CM
getting funky way, way too early... Don't get me wrong I think the 6.5PRC/6.5SAUM and 7MM are great rounds for special purpose, especially hunting with lighter guns at longer ranges.
I'd really figure out what your main goals are first. I switch barrels like a lot of people, but also find that sometimes it is just less expensive just to buy a second gun if the intended purpose makes sense. Lets say you just want an occasional light weight hunter and that's your thoughts on a 6.5PRC. You'll be about $1200+ for the conversion on the cheap with a good barrel.. I was in with a smith spun CF Proof for the 6.5S, bolt and bottom metal $1,800. My Tikka superlite magnum was about $699.00...
Just food for thought. Don't under estimate the 6.5 as a hunting cartridge if your not talking really long shots on Elk. Below is a picture of one of my 6.5CMs I use for fields style matches and some hunting. It is not uber light, but comes in at 12LBS with a scope that has real turrets the bipoid and sling. As a side note, people don't often weigh their rigs in complete trim; heck an Atlas PSR and thicker sling often add 2lbs. Anyway, do not sell the 6.5CM short for hunting if that is your thought for the 6.5short mag... The pig below was shot by my Son tracking off tripod running at full speed about 400 yards away, and summersaulted on impact dead. This with a little 120gr factory GMX
@3000fps.
View attachment 7113338
Hope this helps in your decision making process..