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This is what I am talking about...get your hands on what is available. .22 LRM or 9mm, or 5.56 .223 Rem
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What kind of firearm are you thinking of shooting the 7.62 x 51 round in? What kind of shape is it in? |
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Trust me, if I had some open land available to me anywhere close, I'd ditch the range in a heartbeat. :wink: |
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nor pressure specs (SAMMI specs for the .308 are 62K CUP, for the Nato 7.62 are 58K). The issues are twofold: the greater thickness of military brass vs commercial (military is thicker, allowing for much case flowing of shot cases), and the headspace allowance of the NATO chambers vs the .013"shorter headspace allowance for the .308. Shooting fresh (unreloaded) 7.62 ammo in a sporter .308 will cause no ill effects; trying to chamber reloaded military brass that has not been full-resized (not just neck sized) will cause headspace problems, blown cases and all manner of bad things. The guys that reload 7.62 brass without full-length resizing for .308 are the ones who have issues. Regular sizing dies for the .308 are neck-sizing only, you have to buy a special full-length carbide resizing die to get full length resizing on the 7.62. I recently watched a fellow trying to close the action of a very new, very nice and expensive customized FN TSR XP on some reloaded 7.62 ammo (baggie brand); he was using a wooden mallet to hammer the bolt closed. After firing the one round the action seized and even with the intrepid fellow slamming the bolt handle on the side of the table he was unable to get it open again. We breathed a collective sigh of relief when he packed up and left. |
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This is my personal experience, so take it for what it is.
I have yet to have successfully blasted 5.56/7.62NATO ammo (not reloads) through my .223/.308 rifles. Every time I tried, within a round or two possibly three at most, the brass would swell and stuck in the chamber. I literally had to kick the bolt handle back to extract. This happened with good quality surplus GI ammo or First World surplus ammo and not Russian/Chinese steel case ammo. .223 and .308 on the other hand; even reloads (quality reloads from people who knew what they're doing), went through my military semiautos just fine. |
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Due to manufacturing tolerances, every chamber is going to be slightly different; depending on how the chamber go/nogo tolerances between the .308 and the 7.62 overlap on your specific rifle. Your .308 rifle may not work with certain ammo. The 7.62 chamber tolerances were set generous for a reason; so that they could shoot a variety of ammo found at hand from different manufactures in different NATO countries. Sporter .308 dimensions are tighter, allowing for less tolerance to specific ammo, especially reloads. That's just the way it is. If your .308 rifle won't digest 7.62 ammo, hot or cold... don't use it. If you are shooting .308's in a 7.62, watch for base thinning. You may even want to mic a couple of fired cases to see how much case stretch you are getting. Much beyond .007-8 and you are getting into case failure range. |
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