You have a strange one there.As far as I know all were 3" chambered.
However The 20ga R.L. was introuduced in 1977 and the 12 ga appeared in 1982.The book I have here says that the 12 ga chambers were 2.75"(2 3/4"
and 3". Barrels 26",28" and 30".
I would contact Ruger about this. They do not accept Emails but can be contacted at Sturm, Ruger& Co.Inc 411 Sunapee Street, Newport NH 03773 1-603 863-2000 or 863-3300.
I'm curious about this.
Ruger Redhawk
..... A Proud NRA Life Member since 1977 .....Ruger Redhawk
Edited by - ruger-redhawk on 02/10/2003 18:26:30