You can shoot 308 WIN in a NATO chamber no problem at all.
WINCHESTER M14 SAFETY FULL
The only reason NATO went to the larger chamber was for battlefield reliability, (full auto weapons ,M14 M60, headspace does decrese under full auto fire) and the chambering issues with dirty weapons and ammunition. The headspace specifications for the cartridges are SAMMI 1.627- 1.634, NATO 1.628-1.634. Ok you missed it again, both 308 WIN and 7.62 NATO are the same period. theres the whole talk about the pressures to speak of which has been covered many times over ,and the cause of too many consternating arguments ,so not going there ,but looks solid here on the information provided. your findings are correct as I see them on specs and what works and where ,so the differences are the headspacing you've covered ,the shooter just needs to be aware "if possible" which ammunition he or she is shooting in the rifle they are using is correct for it. however a lot of guys have had to find bolts that brought the headspace to the GO spec to 1.635 which is the as new manufactured NATO SPEC chambering of these rifles ,Match grade type A and B rifles excluded as those readily spec out tighter chambers and can use 308 win cartridges with no headspace issues. Well its like us guys with the NATO chambered Garands ,we have to measure the headspace right off upon receiving one of these fine Garands ,mine speced out as new. Please add your info would love to see it if there is any difference to what I have posted. Can you use 308 WIN in NATO chamber? Yes of course, but brass life is very short. It has to work once and that's all the military asks of it and go bang and be extracted. Its heavier due to intended use in weapons that headspace all the way up to 1.6445. Does that make a difference in semi auto or bolt guns, no. On NATO brass the webbing is thicker due to intended use in full auto weapons. In a tight 308 WIN chamber yes you will have issues. Now occasionally you will get stuff like PPU or Indian ammo that headspaces at 1.633. They will work in 308 WIN chambers no problem whatsoever. So like I said Winchester, Federal, Lake City and the like normally headspace at 1.628. Which means that anything from 1.628 to 1.634 is acceptable. Ok the specification for NATO on headspace is 1.634 -.006. Again ,no argument ,I did not miss anything you had said ,however ,I do have my own information and thoughts to add to this ,which are correct. You said heavier ,I said thicker and internally dimensionally different ,I agree with your other statements ,no argument ,they actually make the point quite clearly ,NATO 7.62x51 abounds and is available from many countries as surplus ,not for 308 chambers due to headspace as you have pointed out. If you have a minimum chamber of 1.630, you can run into feeding problems with some NATO spec ammo but normally only overseas stuff, like PPU.
They will let stuff go that headspaces at 1.633 to 1.635 which in a 7.62 NATO chamber is fine, but is. The only time you run into a problem is overseas ammo companies who make ammo to NATO standards. Most US ammo companies who make NATO ammo (Winchester being one) produce to the minimum spec of 1.628 and hold it there, which allows it to be chambered in both. 005 difference, which means there will not be a problem in using 7.62 NATO ammo in a. Looking at the GO for SAAMI and NATO there is a. 7.62 NATO brass weighs in average between 175 - 188 grains. 308 Win SAAMI brass weighs in average between 155 - 165 grains.
Canadian is 1.6315 in.)īoth cartridges have the exact same external dimensions! The only difference between the two is usually the weight of the brass (generally due to thicker brass near base on NATO cartridge).
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