I got mine from Centerfire as well, Magnus was super easy to work with, they let me pick it up at the warehouse, even opened a little early for me!
I shot a box of winchester target shells thru mine on thursday and it did great. I have not put the bushing in yet. I want to see if it wears in before I put in anything.
It shot police buckshot like a champ! The guys at the range really enjoyed helping me break it in