[CCubed]

So, what you're saying is that it is just as dangerous to shoot .308 Win rounds in a rifle action rated for 4600 CUP (7x57) as it is to shoot 7.62 NATO ammo? I understand that I'm not getting it. Look, here's my problem: First, I don't know much about this stuff...at all. This is my first experience trying to decode all this CUP, PSI, etc., gibberish. My second problem is that when you go to purchase a box of ammo, you don't find its CUP on the box. That's all I care about. I don't care about energy and velocity, necessarily. I am concerned with the CUP. My 93 action was designed to shoot 7mm Mauser bullets. Apparently, these have a CUP level of 4600. The 7.62 NATO round has a CUP of something like 5000, and the .308 Win has an even greater number. All I want to know is can this change? Can I go to the store and find commercial ammo with a military or lower CUP level in 7.62x51 caliber? I ask this because I've noticed that some commercial .308 loads have energy and velocity levels that are less than the 7.62 NATO levels. Therefore, my question was, if these levels are lower than the 7.62 NATO round's levels, does it follow that their CUP measurement is also lower? Do you get what I am saying? Is a round's CUP directly related to its velocity and energy? If not, then correct me. It simply seemed reasonable to me, and to the other shooters who I asked, that it would be. I understand I don't get it. I'm trying to.