Hoot,
I am interested in the pressure levels he is staying within on his loads. I am using cast bullets 405 grains and some jacketed bullets at 325. I am doing the best with 405. The data out there is confusing as there are many different types of actions that handle 45/70. Trapdoor level pressures are probably good enough but I have read that lighter bullets faster loads,as those for the Marlin Guide Gun and the West Co-pilot, are supposed do well in these Tangfolio barrels.
Thanks very much
Swampman