This is the best conversion I've come up with, but may not be exact
..............'E.C.'......DuPont…....Schultz…..... ..Ballistite....Infallible
3 dram....42...........36.5............42........... ...24.............21 grains
3 1/4…...45.5.........41...............45............. .26.............23
3 1/2…...49............43...............48............ ..28.............25
http://books.google.com/books?id=97d...AJ&pg=PA57&lpg
http://books.google.com/books?id=Wv0...J&pg=PA446&lpg
Note that the Winchester loads include "New E.C. Improved" and "New Schultz"