Good to see other people on here doing some math.
Having done some of my own its appears that a regular paintball (capsule round from arsenal) should expand out to be ball roughly 60cm in diameter
That should be enough to subdue most targets, especially with a short bust (or perhaps called shots to head or hands???)
Had a Trickster Shaman use this along with mini-grenades of various payloads (Slab w/ DMSO, KE IV, etc.) in a smart firing slingshot. They never saw it coming.
Headshots bone mage's LOS. Useful to force spirits to take 2 complex actions to de-/re-materialize to keep fighting you. Even if it doesn't take out an aircraft's engines, it can definitely lock up their maneuvering surfaces and mess with aerodynamics. Passable as fire retardant, unless your GM says its flammable and then, well . . . it's flammable!
For extra fun, if you've got 5 karma just kicking around, mix with Shape [Barrier Foam] for extra hijinx!