0.25g are best overall for AEGs. Some might buy a bag of 0.28g and have a couple specially ID'd mags loaded with them for special occasions (such as that guy who is within range but behind thick bushes and nothing seems to penetrate) but all the rest loaded with 0.25g.
I've found that 0.29g-0.30g work great in GBBs, the vloctiy drop isn't near the same as AEGs because of the nature of expanding gas. Case in point my G19 that normally shoots 0.20g BBs at 341fps shoots 0.43g BBs at around 265fps, where an AEG set up the same way might see 220-240fps if lucky, most likely less.
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