I do not believe the 2 3/4" Case would have been put there by the proof house. They simply marked the 12/C or 12/LC as stated with 3" being the dividing point. They would have measured the actual chamber length & proofed accordingly. I highly suspect the 2 3/4" Case was put there by Jeffery.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra