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It really depends on what you are going to do with it. If its a sporting gun to go win matches at 600+ yards then go with the 6.5-284, the ballistics are far better than a .308 at range; but it comes with serious availability problems for components. But set-up correctly it is a fantastic shooting round. Just make sure you have a 1000 yard range around otherwise its dumb.
If you want a general purpose gun that you can also take to matches then get the .308 for all the reasons everyone mentioned above. You aren't going to take your 6.5 hunting. ;)
6.5-284 is not a great choice unless you're made of money. It's a barrel burner.
Speaking of barrel life, .308 is going to be at least double that of 6.5CM. Maybe closer to triple. Figure 2,000+ for 6.5 and lots more for .308. Those are VERY approximate numbers.
When you figure a barrel will cost you $600 to purchase and install, it's a very significant factor in real world cost per shot.
To me, the ballistic advantages of the 6.5 outweigh all the pros of a .308. For my money, I'd buy a 6.5, shoot the crap out of it, and then decide if you really need or want a .308. For me the answer was, and still is, "no".
Great thread and I'm debating switching myself. I think I'll be able to sell my 308 barrels, ammo and reloading supplies for a 10/15% loss but it's not a big deal if I am getting a better caliber. If youre worried about bugging out and carrying weight in an ar10 platform, the 6.5 load out will weight considerable less and you will be able to carry a few more 20/25 rd mags for the same weight.
As it pertains to this forum?
The 308 is a no-brainier.
Although, for me at least, a precision type rifle wouldn't even cross my mind for a "survival and preparedness" situation.
I did the opposite , get a .308 , get all your supplies cheap and shoot the crap out of it. If you feel you want to change it up throw a new barrel on it and sell your .308 supplies to someone that went the same route you did. It really depends on your overall purpose of the rifle.