Talk:Smithing/@comment-203.177.187.215-20150314114208/@comment-99.150.246.53-20150315063155

550/660/660/550 works pretty decently for me. In the 7 times I used that formula with a Tachi leader, I got 3 Tachis and 1 Oodachi. (I didn't quite keep track of the times that I used it with a Uchigatana leader though, so don't know how successful that is.)