The Kragicon may have had a slick action, but I have no doubt that the troops assaulting Kettle Hill (not San Juan Hill) with Roosevelt, would have preferred a clip loading rifle instead of fumbling loose rounds out of a cartridge belt. After emptying the magazine, you essentialy had a single shot rifle when you were assaulting a position.

As for the M1917, It was a better rifle than the Springfield, but unfortunately did not have "target sights" and the military of that period was wedded to the target rifle

Oh by the way, After the Boer war, the british did NOT decide to adopt the mouser, instead they added a charger guide to the rifles so they could be loaded like a mouser, BUT with TWICE the magazine capacity.
Now I might add that one of the other changes was more emphasis on marksmanship over square bashing. In August of 1914, the germans found out the results of that.
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