Does not mention what caliber these were, but this may be of interest. It is an excerpt from my Pirkle book:
The Model musket was the only Winchester sporting arm ever to be purchased in significant quantities by the US army for combat duty. At the start of the Spanish-American war in 1895, Major General Nelson Miles, commanding general of the US army issued a request for 10,000 Model 1895 at a cost of $207,000. Their delivery was delayed by military inspectors who refused to pass a significant number of parts. By the time the problems were straightened out, the fighting in Cuba was over. Most of the muskets that were accepted were resold to the new Cuban government in 1906. Only 100 M1895 muskets were accepted for combat use. These were shipped to the Philippines in 1889 for trial by the 33rd US Volunteer Infantry, but were soon returned, rejected as unsuitable. The Krag rifle was judged its superior.
Anyway, that didn't stop the Russians, who as noted above, ordered a contract of 293, 816 M1895 muskets in 7.62x54R during WWI!
As noted above, the caliber was not noted, but since it was in 1895, and the model 1895 was only available in 30US (30-40 Krag), 38-72 and 40-72 and that time, it would have been 30 US. Another interesting tidbit: along with these 3 introductory calibers, the Model 1895 was also listed in 6mm US Navy, but apparently none were ever sold commercially.
Cheers,
Matt