Source-For Trade or Treaty
The Bomford gun is listed as having ramrod pipes 1.258 long, .326 inside diameter, .025 material thickness.
Sizes on the other trade guns ramrod pipe IDs run from roughly 5/16” thru 13/32”, and up to nearly a 1/4” difference in lengths.
While the pipes may be of a similar design, there was a lot of differences from gun to gun, mainly in the spacing of the reinforcing rings.