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Several thoughts... Do you or any of your friends reload? If so, pull several bullets and weigh the charges. Also, check the powder, I forget if 5.56/.223 is loaded with ball or extruded powder but if you have a reloading manual handy you will know what is called for. If the charges are radically too heavy or light forget it. If the books indicate ball and they are loaded with say, flake powder, check to see if any factory loads have that type of powder. Pulling some GOOD factory rounds might help ID the powder.
Also, measure the diameter of the bullets. If they wash or plate their bullets, could they be too fat?? Poor QC??
Would a washed bullet survive the muzzle velocity of a 5.56/.223 round?
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Trying to identify powder by the way it looks is never a good idea...
Ball powders suitable for .223/5.56: Win 748, Hogdon H335, Ramshot TAC, Accurate 2230
Extruded powders suitable for .223/5.56: IMR 3031, IMR 4198, Hogdon H322
Flake powders suitable for .223/5.56: Alliant Reloader 7
Those are off the top of my head. I couldn't give you useful charges for any of them without consulting a loading manual, but all should work in .223 Remington/5.56mm NATO. There is NO WAY TO TELL WHICH POWDER IT IS. You may be able to tell which powder it's not, but even that doesn't really help you.
If you are going to disassemble a few rounds to test, the best thing you can do is test for consistency. Weigh the powder charges.
Pull 5 rounds from each box and weigh the charges one at a time. After the charge is weighed, record it and then dump the powder back into the case (use a funnel), but don't reseat the bullet yet (make sure to keep the cases separated, too so you don't accidentally double charge). IF you come up with any rounds that are more than 0.1 or 0.2 grains off, that round is junk. If you get more than 2 of these junk rounds, pitch the whole lot of them.
If you want to deactivate the rounds first, you should be able to soak them in water overnight to deactivate the powder and primers. If they are sealed, this probably won't do any good, but I doubt they are. You'll find out when you pull them. You might even consider pulling the bullets first and saving them if you reload.
For what it's worth, the general consensus on most of the boards I read is that A-Merc (which is what you have) is OK for blasting ammo, but the brass is crap for reloading.
NOTE: The ammunition recall link you posted is for .45 ACP specifically. That is not what you bought and I doubt that you'll have a problem. If you're worried enough to go through all of the trouble I've suggested, though, just pitch it as crap ammo and buy some Winchester White Box at Wally World to get by for a while.