common in europe for making cheap shot by poachers was to chop lead with an axe to the size you need. we have endless reports up to WW 1 when poacher kill forester with such choped lead, after the war they had military rifles.
because the axe is a basic tool it seems me the best way to make shot at home. Remember to try this in my younger years and load some 12 ga with blackpowder and this stuff. use it on clay pigeon and got some.
well I was told by bystander make some hits but never see it because of the smoke.

in the end to chop lead with the axe is a lot of work and I will let it for the case of need