Thanks for the measurement.  As soon as I fix the stock...
It's been one of those weeks.  The stock had a length-wise crack in it that had been repaired at some point.  It looked strong and I've been shooting the rifle with no problems.  Well, this morning I picked the gun up by the stock, and the stock split apart along that crack. Hmmm...
I was probably going to take it apart and repair it at some point - now I have no choice.  So, I cleaned it all up with Acetone, drilled holes for two pegs, mixed up some epoxy with a bonding filler, and now it's all clamped and hardening by the woodstove.  It should be much stronger than that old repair.
This is the crack before it split:
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