Hi Sean,
I went to the "We Proceeded On" website and tried to search for Keller, Cowan, Wier, rifles etc, and did not come up with any reference to a paper. Supposedly the article appeared in the May 2006 issue of the journal. This "expedition" short rifle sold by TRS has my red flags up. Finding a rifle with serial number 15 is almost too coincidental since there were supposed to be 15 of the rifles on the expedition. The gun has no sling yet the inventory for the trip calls for 15 rifles and 15 slings. If the gun was generally accepted as an expedition rifle wouldn't you think that would be huge news in the antique gun world? Yet, I can only find little snippets here and there mentioning it. I have no vested interest in whatever guns L&C carried, however, some of the players in this debate do. I am sure the owner of the gun would love to claim it was an expedition rifle because it would be priceless. TRS put a lot of effort into the castings for their 1803 Harpers Ferry rifle and were reportedly not very happy when Tait published his paper on the contract rifles. They certainly have a vested interest in marketing the "true" expedition rifle. With all the fakery in the antique gun world, you have to be very suspicious of anything that looks too good.