I'll metnion this again, as apparently you missed it the first time.
Call or email Gary at
http://www.cartridgeconversion.com/
This is a man that specializes in cartridge conversions. He's the factory authorized installer for Kirst.
There are things that can be done outsied of what you see on Kirst or Howells websites.
He also is quite knowlegeable on all things conversions, incuding heeled bullets.
This is your "go to" guy, and he works at VERY reasonable rates.
If I wanted a 1860 in 44 Colt... he's the first guy I'd call.