^True. (I mean XM is right)
Madbull have wide tolerances on their quality control.
the best .30g bb i've used are Bioval .3g (white). I've put about almost 10,000 rounds (ten thousand) through my sniper rifle, and in my own experience, the bioval .3s have the best trajectory, range, and consistency, if by only some modicum like 5 or 10% more than any other bb. The .3g biovals also perform just as well as the highly coveted, and much touted .29g Maruzen Super Grand Master bbs (SGMs), but at a lower cost ( compare 26$ for 3300 vs 25$+ for 500 (five hundred))
The only downsides to the .3 biovals would be availability, and, for some reason, the bioval .3s are harder to load into my L96 mags. They're not bigger than most bbs, in fact, they are noted to have a slightly smaller diameter, so maybe this affects how they stack / stagger in a magazine.