Buffalo Bore or Garrett would have been my preferred brand for the 45/70. But Ammo is slim pickins lately.
I picked up Underwood ammo. 305 grain penetrator slug at 2100 fps. I also use underwood 220 grain hard cast coated bullets for the 10mm. They are running right about 1300FPS from my 7 inch barrell. Not perfect but pretty decent for a semi-auto pistol.
For the 12 guage I keep some Brennecke black magic slugs. They are insane. 602grain slugs at around 1500fps.