I have 30-30 dies on the way as I'm cooking up a way to make 30-30 soft points out of milsurp 7.62x39
All you have to do is take a file and round the tips alittle(don't go nutz or it could be dangerous) and using once fired 30-30 brass that you resize and prime, then dump the surplus powder in about 20gr of it and maybe about 26gr max,cap it with the file'd milsurp pill and off you go. If your overly worried about a .311 in a .308 bore(done it about a million times when all I had were hornady .311 tips for my 30-06) you can use a lee push through sizer and some case lube. I've found these file'd down rounds in my 30-06 will expand like mad inside coyotes and considering it's about 123 gr SP it really speeds along. These are not instructions this is just what I do and if you want to do it, do it at your own risk. That being said I've looked in my reloading Manuals and will be safe,just always do your research before phucking with ammo
Cheers