David,
That is interesting. I suspect that those early full length tapered bores were made during experiments to obtain improvements in choke. In the late 1860's and 1870's Parker, Greener and other makers were just learning about choking methods, and some of the very early Parkers had relief muzzle boring, while others had constrictions of different extent, contour and degree.
Have you patterned your two barrels? Also did you do the measurements of the bores to determine the bore diameters were from chamber to muzzle. If so, I would be very much interested in learning the results.
Richard
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Threaded Mode