The problem with buying once fired military 7.62 brass is the vast majority of it is fired in machine guns. Meaning the chambers are .003 to .004 larger in diameter and full length resizing will takes more effort.
I buy a lot of once fired 5.56 brass from BrassBombers below, I would buy one of their sample packs of 7.62 and see what you think. The 7.62 brass is thicker and has 2 grains less of H2O capacity so you will need to make workup loads. I bought a sample pack to see if they would work resized to .243 but the necks would require turning so I gave up on that idea.
If you notice all their Long Range 7.62 sniper once fired brass is always sold out because it is high quality brass and only fired in bolt action rifles.
For a M1A the standard 7.62 brass would be OK but if you have good accurate .308 bolt action you will be spending time weight sorting and prepping these type cases. Again remember they were made to be fired (sprayed) from a machine gun and are average in uniformity.
.308/7.62 - Cleaned, Deprimed & Swaged - LC Only - 100 Pieces $24.00 Free Shipping (read the reviews, many shooters buy this type brass and like it)
http://www.brassbombers.com/308-762-...-7LC-SSP10.htm
Once Fired Brass
http://www.brassbombers.com/main.sc
I buy 500 once fired Lake City cases at a fraction of what 100 Lapua cases would cost. I use the most uniform brass in my .223 bolt action and the rest in my AR15 rifles. So try a sample pack and see what you think.
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