How come all the blackpowder cartridge designations list the calibre first and number of grains of black powder second except the .38-40? (.45-70, .44-40, .25-20, etc.). My Colt single action .38-40 takes a .401 bullet and the case holds 35 grs. of 2F. I suspect that the old balloon head cases could hold 38 grs. Shouldn't it be a .40-38? Inquiring minds want to know.