Barrel life is much longer on .308. A good .308 barrel won't see a significant accuracy degradation for at least several thousand rounds, likely more.
Basic .308 ammo is much cheaper (a simple comparison on ammo seek will demonstrate that). Match-grade ammo for both will cost about the same, but with .308 you at least have the option of saving money by using cheaper ammo for practice.
There are plenty of good .308 rifles (new and used) that can be had for a steal on gunbroker.
6.5CM offers lower recoil (not that .308's recoil is horrible by comparison, especially with a good brake). And it offers loads with better BC's. In theory, this means you'll have an easier time acquiring targets and cheating the wind with the 6.5 CM. In practice, I don't know how much of a difference it will make for the average shooter, or a beginner one.
To put it another way: you, as a new shooter, are not necessarily going to see exponentially better performance just because you're shooting 6.5CM. Good fundamentals and practice will be the two biggest factors which determine your progress early on. If/when you get to the point where you're competing at high-level PRS type events, then the advantages of 6.5CM might become more relevant.
Get what you can afford. The .308 ammo and platforms are easier to get into if money is tight.
Basic .308 ammo is much cheaper (a simple comparison on ammo seek will demonstrate that). Match-grade ammo for both will cost about the same, but with .308 you at least have the option of saving money by using cheaper ammo for practice.
There are plenty of good .308 rifles (new and used) that can be had for a steal on gunbroker.
6.5CM offers lower recoil (not that .308's recoil is horrible by comparison, especially with a good brake). And it offers loads with better BC's. In theory, this means you'll have an easier time acquiring targets and cheating the wind with the 6.5 CM. In practice, I don't know how much of a difference it will make for the average shooter, or a beginner one.
To put it another way: you, as a new shooter, are not necessarily going to see exponentially better performance just because you're shooting 6.5CM. Good fundamentals and practice will be the two biggest factors which determine your progress early on. If/when you get to the point where you're competing at high-level PRS type events, then the advantages of 6.5CM might become more relevant.
Get what you can afford. The .308 ammo and platforms are easier to get into if money is tight.