Re: Recommendations on a 7.62x51 bolt action
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tylerw02</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BasraBoy</div><div class="ubbcode-body">tyler, as far as I know part of the UK proof procedure is to fire a test round that is normally between 25% and 50% over pressure to test the integrity of the rifle.</div></div>
.308 is max pressure of 62,000 while 7.62 NATO is 50,000. If the AI is proof-tested to 125-150% pressure, it is tested to a minimum of 62,500 (125% of 50,000).
Here's what Accurate Shooter has to say:
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">.308 Win vs. 7.62×51–The Straight Scoop
Before we go much further, we want to address the oft-posed question “Are the .308 Winchester and 7.62×51 NATO one and the same?” The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62×51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win “Go Gauge” is 1.630″ vs. 1.635″ for the 7.62×51. The .308′s “No-Go” dimension is 1.634″ vs. 1.6405″ for a 7.62×51 “No Go” gauge. That said, it is normally fine to shoot quality 7.62×51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: “[N]obody makes 7.62mm (NATO) ammo that isn’t to the .308 ‘headspace’ dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule.” You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62×51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone’s 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell’s .308 vs 7.62×51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62×51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62×51 brass, such as Lake City or IMI.</div></div>
Either way, the OP can get by just fine with a .308 shooting NATO ammo. </div></div>
+1 shooting NATO in .308 chambers is fine. I shot quite a few NATO round through my stock Remington SPS .308 and it was fine. Not one issue to worry about. Also here is some nice PSI and CUP info.
http://www.shootingsoftware.com/ftp/psicuparticle2.pdf
Aron-