What do folks think about the PRC surplus .308 ammo from TradeEx (which is actually stamped 7.62x51 on the spam cans) vs what Canada Ammo and Budget Shooter Supply are selling. CanAm bills it as Norinco 7.62x51 NATO and Budget Shooter calls it Norinco 7.62x51 new production. It all ships in spam cans, but the surplus from TradeEx is 520 rounds per can vs. 500 from the other two. It's all steel cased and copper washed and non-corrosive. Is it basically the same stuff, or is one much newer than the other? If so, does this make a difference? I know that I still have a bunch of Norinco that came from CanAm with my M305 in the green boxes, and it shoots really well. I just got a case from TradeEx, and I'm hoping that it shoots similarly well. Thoughts, anyone?