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Think of it like real steel, no matter how fast a 5.56 is traveling, nobody is ever going to use it to hit targets 2km away. And it's not because it's inaccurate either.
The .20 is going to leave the barrel faster, but out at 100ft or so, a .28 is actually going to be traveling faster, since heavier BBs lose their velocity less quickly.
Inherently, because they're heavier they also tend to be more stable and more resistant to the wind.
Run as heavy ammo as you can until you start losing range, basically.
at 380 you want to be using .28s
at 400-420, .30s or .32s
up at 470 if you're not using at least .36s, your totally wasting all that extra energy
The reason guns lose range with heavier ammo is simply because they can't put enough spin on them to induce proper hopup. They'll jam the gun before the hop rubber applies enough force to get the right backspin.
That's why between a stock 300fps pistol and a stock 320fps aeg, the pistol will shoot awesome with .30s, but the aeg will lose a lot of range. It's because the pistol applies higher pressure to force that BB through the hop rubber and get more spin.
It's also why Rhop works so damn well. It's not a standalone upgrade, you pair it with using heavier ammo as well. So if you were using .28s at 380fps before, then Rhop, then start using .32s.
The longer flatter patch allows a longer surface for hop to be applied, with less force. Meaning you can now apply the proper amount of spin on a BB you'd normally lose range with.
I run .30s in my ptws, and .32s in my pistol. It's a stock KSC usp compact (the pre-system 7 version, so its a few yrs old), and it'll shoot 140ft pretty darn accurately. Recently put an Rhop in it, didn't make much of a difference.
I only use lighter ammo indoors, because it's cheaper and actually hurts less.
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