Because generally as battle rifles they hate battle conditions due to their complexity and close tolerances. So in WW1 there was the Ross rifle from Canada, generally after a few weeks in the mud the Canadians ditched their Ross's for Enfields.
If you want a fast action (rounds fired per minute) the Enfield is hard to beat, if you want indestructibly strong action probably the Mauser Action. Either are very safe, reliable and easy to maintain, straight pull's are not. If you want accurate then a smaller calibre such as 6.5 or yes 7mm hence why I am looking for a Swedish M96 right now.
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