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Many moons ago when the variety of powders available to reloaders expanded, the initials  IMR  were used to designate canister grades of  I MPROVED  M ILITARY  R IFLE powder.  As time went on, the  IMR label became the property of DuPont.  The transfer of the IMR designation went with the company line of products, which is now owned by Hodgden.  The XMR designation was probably adopted to avoid copyright infringement by a competitor