I just bought a Henry single shot for the express purpose of lead bullet shooting. A .30-30 seems like a very logical choice for that, along with my .45-70 Repro Highwall. There are others as well, but these two will be the focus at first.

I want to very carefully enter the bullet casting game, those two cartridges seem like a good starting point to me.

I have been a life-long fan of the .30-30, and really like your choice. Congrats on rediscovering rifle shooting.