Considering the possible issue with game wardens, is it worth shooting cast bullets? A couple of boxes of decent hunting bullets will last decades and be easier to develop a load with. If you want a lower recoiling load, using jacketed bullets designed for the .30/30 at .30/30 velocity will do the trick and not raise any questions.
Go ahead and get a mold to muck around with, but hunt with jacketed. There is no advantage to hunting with cast bullets, except the pride of accomplishment.
I am a KISS person.