I form 7.7 Japanese from 30/06, I do not have the 7.7 case forming die, I do have a 308W forming die, after forming I use an old Herters full length sizer die to finish. I suggest new unfired cases or or once fired, I also suggest using different head stamps as in 20 Military LC, 20 R-P cases, etc. when sorting brass after tumbling it is easier to sort by head stamp.

F. Guffey