Wow! .69 dude!
What are you goimg to shoot? RB? That's a big ball.
I know Lyman makes a .69 Minie mold, but that sucker is for a 730 gr bullet.
Lee makes a single cavity RB mold for the .69, only $24. Not bad.

Have you researched a load yet? Fill us in, this is one that interests me greatly.
I finally got my Kentucky .50 pistol tuned to where it's accurate one handed (duelist style) out to about 20 yds.

That tower pistol looks like alot of fun. Congrats!