I do have a box of the Hornady FTX 325gr, which have a soft pointed tip and are suitable for a Marlin. PM me if you want them. I have some Cast Performance 405gr but they are also WLNGC and may not work in your Marlin.
Those Flex Tip Hornadys don't load right except in a 450 Marlin case which is 1/10 inch shorter than 45 70 case.I bought some and had to send them back.
Look for a p m Roger.