(1.)I think you are completely misunderstanding me and the point i am trying to make. You stated in an earlier post,***(It is important for us to remember the 307 and 356 Winchester are both rated for 52,000 CUP the same as the 308 and 358 Winchester.)***
(2.)Note.(CUP),COPPER UNITS OF PRESSURE vs (PSI,POUNDS PER Sq INCH).They are two entirely different measures of force being exerted within a case/Chamber when fired being that the 7.62x51 Nato Military round is designed around working pressure's of 52,000 cup & 50,000 - 53,000 Psi Max working pressure opposed to the .308 Win.caliber factory loading's such as Win., Rem., & Fed as well are rated at 52,000 cup's and as high as 62,000 Psi which is way higher plus the fact that this case differs from the military 7.62x51 Nato and using the commercial ammo in a firearm designed for the Nato Chamber can have some Drastic end results. The bottom line is the commercial brass is thinner and has a different demision as well and allows for the higher pressure where as the Nato round is or was not designed being of different demension and Thicker case walls & web area so there is no way for anyone to attain the same velocity/speed and energy of either a .308 Winchester or a .358 when using the .356 Win.& .307 Win. calibers respectively. Also note that the .358 Winchester case is nothing more than a .308 Win.necked up to .35 caliber.
(3.)The .308/7.62 is the exact reverse of the .223/5.56 situation. The 7.62 case is heavier and thicker than the civilian case, but it is loaded to a lower pressure than SAAMI spec .308. The 7.62 NATO is 50,000 CUP PSI and the SAAMI .308 is 62,000 PSI.
What this means is that you can shoot good quality milsurp 7.62 NATO ammo in a commercial (read civilian) .308 Winchester rifle all day long.
(4.)You should not shoot full power .308 Winchester ammo in 7.62 NATO milsurp rifles. The 7.62 chamber is longer than SAAMI .308, the commercial brass is thinner and the commercial ammo is loaded to much higher pressure than 7.62 ammo.
(5.)Finally,
The 7.62 case is heavier and thicker than the civilian case, but it is loaded to a lower pressure than SAAMI spec .308. The 7.62 NATO is 50,000 CUP and the SAAMI .308 is 62,000.
What this means is that you can shoot good quality milsurp 7.62 NATO ammo in a commercial (read civilian) .308 Winchester rifle all day long.
You should not shoot full power .308 Winchester ammo in 7.62 NATO milsurp rifles. The 7.62 chamber is longer than SAAMI .308, the commercial brass is thinner and the commercial ammo is loaded to much higher pressure than 7.62 ammo.
