It's funny you mention that. I also achieve better results with gas pistols using heavier weights.
I think this may be because heavier bbs are less effected by environmental factors which become more pronounced at exceptionally slow velocities.
It may also be that the amount of hop up applied and muzzle velocity differences (inherently larger in gas guns) may very well outweigh the advantage of a slightly flatter and more stable trajectory.
I think it's now safe to conclude that there is no appreciable difference between .25 and .28. and that for spring operated guns, a muzzle velocity around 300~330 is best where gas guns will benefit from as much weight as you can reasonably pack on.
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