I have the same gun, with 2 3/4 chambers, but you need to confirm what yours is.... Magtech brass is an ALL brass casing, they are pricey but if you look after them, and don't step on them, they will last darn near forever... The "cool factor" of this brass is unbeatable! It is definitely on my list.
I shoot black powder loads only out of my gun using Federal paper hulls, it works good but you only get about 3 reloads out of a hull...
I have shot Hogdon 777 with Winchester AA hulls and plastic wads (Winchester Red WAA12r's) and it works good too, but it isn't the same as true black powder.