Trust me, I've got a point towards the end.
I see you needing two or more molds, but you don't have to pay for them.

Thanks to some great folks here, I'm getting back into casting after a 20+ year hiatus.
While casting today I started calculating how much I'd invested and how many boolits I'd have to make to amortize the equipment. The figurative slap upside my head was that only the cost of the lead and lube matters. Every piece of equipment could be resold and I'd still have my boolits.

My advise to you is slug your bores, purchase an appropriate mold - cast several thousand boolits and then sell the mold. Repeat as necessary.