I have used a .684 for the last 5 years.
Paint has gotten smaller since 2007.
Larger bore is only usefull for humid states.
But .692 or higher are almost unnessassary altogether.
If a paint is produced closed to this size, it's a bad batch.
I may be wrong, but almost all paint is now .683 or smaller.
#9 of 19 PBX LV1
Lime Dye Rotor
Lime PBX 68/4500 a tank w/Ninja Reg
for the #1 field in Chicagoland