Well,I've done a little of my own research on C300's site.Seems that vaccine has larger particles than lets say UFO or UFD coverstocks.( both particle)How that translates,I'm not sure...Earlier roll perhaps?? I don't see any other balls in their lineup that use this cover....Oh well,I guess I just answered my own question...
"You knooow,beer makes you smart it made Bud-wiser"   Harry Caray.

Edited on 1/24/2005 2:28 PM

Very early even rolling ball so maybe larger particles would equate to this so your theory might be correct, good ball on an over/under wet/dry shot or someone with less speed. Does not hook a ton but does roll well and is very consistent in reaction shape from the one that i own.