I have an 87, built in 1891, that came with a "As-Is, Do Not Shoot" label affixed from the shop I bought it from.
As well as a nickel plated, side-levered, hammered 10ga double.
That didn't stop me....
So I order full length hulls from Ballistic Products, pre-primed, Federal or Cheddite.
http://www.ballisticproducts.com/Cheddite-10ga-3-1_2-86mm-hulls-50_bag/productinfo/1391035/
I made myself a tool that I cut about 3/4" off each empty hull, although Ballistic Products makes one as well.
http://www.ballisticproducts.com/Trim-Doctor-Shotshell-Case-Tool/productinfo/TRIM/
Using a larger Lee scoop, I put two scoops of 2f, a 1/8" card wad, a 1/2" lubed cushion wad, then two scoops of shot, then an over shot wad.
Use the roll crimper from Ballistic Products as well to finish it off.
http://www.ballisticproducts.com/Original-Roll-Crimping-Tool-10ga/productinfo/ROLL10/
The Buffalo Arms ammo looks to be exact replicas of what I produce for my own use.