"To say that these bbs are legitimate sniper bbs, is total BS. I own a digital triple balance beam and I measured exactly 350 bbs and none of them came up with mass more than .26g. Due to this, when using a sniper rifle with 350+ fps, accuracy is to say the least limited (about a two foot grouping at thirty yards). However when using a automatic (i gave the bbs to my friend when i found they were worthless) they seem to work fine. I'd say stick with the Goldenball .30g JDM ultra seamless competition grade,they all weigh .29-.32g, they're very accurate, and they're cheaper."