My Winchester 94 likes 33g of IMR 4064 and a Sierra 170g bullet, for a velosity of 2130 fps. Most of my loading has been done for bolt action and single shot .30-30's, so it will do you no good for the Marlin. I have had good luck with H335 powder, and that may be a good place to start, but Win 748 and Hodgdon's BLC-2 are good too. Good luck and have fun.