STUMBLED UPON SOME MAGNUM RESEARCH "DESERT EAGLE 480" REVOLVERS ON GUNBROKER, 7.5 INCH'ers WITH THE BISLEY GRIP FRAME. LOOK LIKE BFR REVOLVERS BUT INSTEAD OF BEING 475L/480R THEY ARE JUST 480 RUGER. BESIDES NOT BEING CHAMBERED DEEP ENUFF FOR 475L, ARE THERE ANY OTHER DIFFERENCES? WHY DID MAGNUM RESEARCH GO WITH JUST THE 480 CHAMBERING?