I don't know about northern Indiana but we southerners have many places like Friendship to go get your pioneer on.
It would mean a drive but it would well be worth it.
Other than that I recommend watching the "gatherings" section toward the bottom for a get together nearer you that some of these fine men would be more than willing to help you out.
Personally I have both a trapdoor rifle and carbine I would share but I am only a short hop from the Ohio River which is further than Friendship...
has one the First Sunday of every month at the outdoor range. Rain or Shine. Everyone is welcome!
All muzzleloading, blackpowder (or substitute blackpowder) arms are welcome at our shoots, including inlines, revolver & single shot pistols & traditional flint or percussion rifles.