I have the mold and a couple of 32-20 Marlins but have yet to try it. Works real well in my 30-30, 308 and 30-06. Can't remember what it drops from the mold. I run it through the .311" sizer when I seat the Gas Check so I'll have to see if I have any as-cast to run though my .313"
I measured some of my Lee Soup Can bullets that were unsized. It looks like they drop from my mold .312" ish with a 20/1 alloy. That would lower my expectation of what they would do out of my 32-20's where .313" or bigger has shot the best in the other bullets I have tried.