Paul, my 10 gauge 1879 Lifter is configured like yours. I have a 'cheesy' inside divider and managed a crude measurement of .809" about 2" forward of the chamber. There is an imperceptible jump from the chamber to the bore. The chokes measure .790"-ish (I don't have the figures at my desk). I questioned the bore size, but have been informed that Parker bores, at that time, were not always consistent with any set standard. I will re-check my measurements this evening. I am preparing to chase the Ruffies this morning with my RBL. Cheers!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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