Dave you might want to check out the Buffalo Bore offerings for the 38-55. In "Cartridges of the World" The author indicates the 375 is 1/10" shorter than the 38-55 and that 375's should NEVER be fired in any rifle other than thoose specifically marked for it do to the higher pressure from the 375. If you do not have a copy of that book I can tell you the auther makes note of several rounds that are interchangable and can be fired in different chamberings however this is not one.
