Another NH!
Here are some photos of my new 1903 vintage NH. With my inside dividers and caliper, I come up with .830", just beyond the forcing cone area. The muzzles measure .740". I would say that F/F would be a good guess! I just sent for a letter. I hope it has some interesting data.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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