From an 1892 book "Infantry Fire; Its Use In Battle":


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Evidence that "loaders" were being considered for the Krag Jorgensen rifle at the time of acceptance by the Ordnance Department. See page 211 where it is stated:  "If the cartridges as so packed and carried that the magazines are refilled at a single motion, the fire may be more rapid, whether it be continuous or intermittent, making control still more necessary, in order to prevent the waste of ammunition which lack of it would cause."

And in the footnotes:  "The magazine is very quickly loaded, either by using a movable "loader," or by pouring in the cartridges from the palm of the hand..."

This book was written by Jos. B Batchelor Jr, 1st Lieutenant, 24th U.S. Infantry. Published in 1892.