Some additional info I found while poking around the internet:
In reference to the Barnes bullets that Jay Wolf mentioned, I believe he was speaking of the
Barnes Banded Solids, which are "
machined from homogenous copper/zinc alloy" according to the Barnes website. An alloy of copper and zinc is better known as...
brass.
In addition to the above product page listing the ballistics of .223, 6.5mm and 7mm (the diameter of 6.8SPC projectiles), they are also currently available for sale from the
Barnes online store. According to the letter of the law and, apparently, the ruling touted by the agents who allegedly raided Elite Ammunition, these rounds are "armor piercing."
As for Mr. Wolf's points C and D, I'm not sure what he would be talking about. Solid copper bullets are not a violation of of the 1968 GCA as they are not of a construction mentioned above in 17(B)(i). If the ATF agents who raided Elite and confiscated his products took his copper projectiles it was likely because they were grabbing everything they could. I highly doubt if the average ATF field agent knows the difference between copper and brass or could spot the difference. Or that they would care. The issue is not with the projectiles being solid, it is with them being made of brass.