Here is an article by Lt.-Col. Andrew H. Russell of the Ordnance Department. It showed up in the "Journal of the Military Service Institution" from 1906, page 47. It has some surprising revelations of the box magazine design and the "cartridge clip"  (along with Krag info).

The link is below, but I also added the first few pages to whet your appetite. This article is best viewed once downloaded as a pdf file. If you are interested in the U.S. Magazine rifle development and what did/did not transpire, there are some significant claims in this read.

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