HEAD0001
Give them a call or go over to Dougs board and you can read about them. Lately lots of guys have been getting them for T/Cs. They dont have much listed on the website but the guys that have shot them swear by them.
The 45/70 conversions can be a bit more finicky but knurling the bullets seems to solve those issues. Even mild smokeless 45x40 200gr sabot loads are well into the 2400-2500fps range and that is a VERY low pressure load. Not much more psi than BH209 actually and some are about the same as a max BH209 load.
I mainly like the pricing and the extra strength of a true smokeless grade barrel and the faster twist options.