I appreciate the help gentlemen.
2-piper, sorry if I misstated above. I was thinking this was originally a 12, not a 10, and later chambered for as a 10. My chamberless 10 is marked on its flats as a 10, even though the bores are 8 gauge. This one was marked as 12 with 3" chambers first (the hashed out 12 at top, without the 'c' underneath.)
lagopus, I wonder what this would have originally weighed, since it's 9.66lbs now, with 26" tubes and re-bored from an 11 to a 10 (.751 to .775). Balance is actually quite good.
