Saw a 420rnd ammo can of green tip for sale at the Hanover Walmart today. I've had pretty good luck with with m855. It always goes bang and groups reasonably well.
it isn't. the cores aren't anywhere close to concentric or consistent, so while they all may weigh 62 grains +/- .02 gr or whatever the variation is, they're not balanced in flight and will tend to destabilize fairly quickly. not to the point they're tumbling or keyholing, but to the point that accuracy degrades noticeably.
makes for decent plinking ammo, but if you're set up to handload, you can load far more accurate plinking rounds for a lot less money.