So I recently bought a CETME Sporter, and I've been hearing different arguments about what ammunition to use. I understand that there's a difference between the civilian .308 and the NATO 7.62x51. What I'm wondering is if anybody on here owns a CETME and has any personal experience with it and ammo? I've heard there are problems with the brass being demolished using .308, and that sometimes it fails to cycle unless you use the higher-pressure, higher-quality NATO stuff.
I didn't realize, however, that finding cheap 7.62x51 NATO is a lot harder than it used to be, what with a lot of the military surplus stockpiles worldwide drying up. I'm wondering if my CETME will function properly using .308...I'm not worried about damaged brass, as I don't know how to reload (yet

).
So....comments? And thanks for any input.
(And yes, I've read the horror stories about Century Arms, but apparently those are a thing of the past)