Not surprising. Never ran across any evidence for a MSM unit carrying Smith Rifles, but I have for Wesson Rifles. And then there's always those reports from 1864 discussing the results of Missouri competitive tests on various rifles, with declarations that the Wesson Rifle was the best self-exploding cartridge rifle.

Below are two links, if they hold up in the post, for images of Wesson Rifle .44 cartridges. If the links don't work, then a cut and paste should.

http://www.worthpoint.com/worthopedia/nice-44-cal-frank-wesson-rifle-cartridge-mm

http://www.ebay.com/itm/Civil-War-Frank-Wesson-Rifle-44-caliber-single-shot-cartridge-bullet-MM-162-/271272145666?pt=LH_DefaultDomain_0&hash=item3f29147302