So, why set a very long 1.636 headspace in an M14/M1A or M1 Garand? It probably is the conflict mentioned above. I.e., if anything, NATO ammo seems to hold at the minimum SAAMI cartridge headspace of 1.629-1.630, better than some commercial ammo! Indeed, sometimes commercial ammo can not be chambered "by hand" in an M14/M1A with, say, 1.631 headspace (bolt will not close completely by gentle hand manipulation on a stripped bolt, although it will close & function when chambered by the force of the rifle's loading inertia), though I have never seen this with NATO spec ammo. If anything, I have found various Nato ammo to be in much tighter headspace/chamber compliance than commercial ammo.
I have measured many, many types/manufacturers of commercial and NATO ammo via cartridge "headspace" gauges as well as "in rifle" checks. But I think that it also near perfect for 7.62mm NATO! I also agree that 1.631-1.632 is a near perfect headspace for an M14/M1A or M1 Garand chambered in. Military field reject limit for the M60 & M14 is 1.6455, nearly 16 thousandths beyond commercial (SAAMI) GO, & nearly 8 thousandths beyond commercial (SAAMI) field reject limit!). Many military gas guns (e.g., M14 Rifles & M60 Machine guns) run wildly long headspace by commercial (SAAMI) standards (U.S. Indeed, cheaper commercial ammo can fail at the 1.638 headspace (e.g., UMC) in an M14/M1 Garand. Lake City brass is Nato spec and reloadable (most NATO is not reloadable, rather it is Berdan primed). It is precisely why Lake City brass is so highly sought. or NATO Mil Spec Ammo (always marked 7.62mm & with a cross enclosed by a circle) since the NATO mil spec calls for a far more "robust" brass case than often found in commercial (read. I completely agree with Jerry that if you have a chamber with headspace much in excess of 1.636 (say, 1.638, SAAMI field reject), you must use only U.S. When we do I'll report the results of our conversation. He had his plate full, so we decided to chat on this in the future. I broached the subject with him some months ago.
308 Winchester and 7.62x51mm NATO ammo, headspace & chambers.
#WINCHESTER M14 CO2 RIFLE WORKING BOLT MANUAL#
Jerry Kuhnhausen, in his classic Shop Manual (available from Fulton Armory see the M1 Rifle Parts & Accessories or M14 Rifle Parts and Accessories Pages under Books) has published a somewhat controversial recommendation concerning. You may get a surprise.Ĭlint, What's the difference between. 308 commercial in a military arm chambered for 7.62MM, first check the headspace with. Most of the time it's a distinction without a difference. Use military ammo or the best commercial only, e.g., Federal Gold Medal Match.
Thus, using commercial ammo in such a rifle is not a good idea you need stronger brass. 308 chambers, as a rule.īut in some 7.62MM rifles the chambers are long (to the 7.62MM military spec), notably the Navy Garands with 7.62MM barrels. They are the same, 'cause nobody (and Clint's been looking for many years!) makes 7.62MM ammo that isn't to the. Howver, the chamber drawings are different. You'll get an endless discussion of pressure specs, endless because SAAMI and the Ordnance Dep't measured pressure in different, unrelateable ways. 308 Win was released by Winchester several years before the Army standarized the T64E3 as the 7.62MM. This is a perennial topic, kinda like ".45 vs. 308 Winchester & 7.62x51mm NATO? by Clint McKee and Walt Kuleckĭumb question i alway thought these 2 ammos where interchangeable but some have told me otherwise whats the story? jim 308 Winchester & 7.62x51mm NATO? What's the Difference between. Real-Gun.Fulton Armory: What's the Difference between. Looking to sell a Deactivated gun or a collection of de-acs? Please contact us by clicking here for a good deal! 50 cal on the roof of your Jeep and take a drive - its fine on private land at shows but given the current climate please do not stress our Police any more than they currently are!
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