Nobade,
Many years ago I bought the RCBS 300FN for my 45/70(s) it is a double cavity mold of theirs, it casts perfect and to size.
I've always been much happier with the RCBS designs, their molds have always been excellent in all the calibers I've cast for (everything from .224 to .458) and although I've never had to use it myself, their customer service has been touted as courteous and much more responsive.
save yourself the hastle of paper patching the wrong sized bullet and buy the RCBS mold.