A slingshot might work if you twist the rubbers 1:20. Otherwise, it won't stabilize that long of a bullet.

I was asking because yesterday I responded to the ad below and may soon acquire a .36. Based on the original purchase date I suspect it's a TC, either a Seneca or Cherokee.

Quote:

Hawkens 36 cal rifle with all bullets - $250
hawkens 36 cal rifle muzzleloader with all the bullets,bought in the early 80s $250,,will send pics