Yes that was one of my 1-28 twist guns. I used a Lee C-501-440-RF 500 S&W bullet paper patched and sized to .501 with 80 gr of Pyrodex P and a over powder wad.
Those big meplats on those bullets smack HARD. I have never heard the sound of the bullet hitting with Hornady great plains bullets. I have seen three animals killed with this 500 S&W bullet AKA "Moose Maulers" and the sound is unmistakable. Ron