My condolences to the Mule:

Zinc is eminently cast-able and swage-able if that's a word.

Will come out light but that's not a bad thing for pot hunting. One of the old hand loaders digests had an article about doing this for big bore rifles for deer and plinking might be able to look it up. Lead molds work fine but I think the shrinkage factor is higher so may want to go oversize and swage back down. No need for gas checks and can be loaded fairly hot before stripping or fouling occurs.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli