copied from a simular thread on the SaSS wire. I'm not the author
REVOLVER CYLINDERS
• Centerfire and rimfire cylinders may have no less than five and
no more than six chambers.
• The front of the cylinder may be beveled.
• Unfluted cylinders may be fluted.
•
Lead in grooves may be cut or extended.• The revolver may be altered to allow the cylinder to spin in
either direction.
• Cylinders may be rebored, lined, or sleeved to any of the
approved revolver calibers provided industry safe limits are
maintained.
• Cylinders must be made of steel or iron only.
Page 13 of the latest online Shooter's Handbook Sounds like the race groves are approved for SASS santioned matches