I had a 505 Gibbs. Very enjoyable rifle. Bertram brass was all I could get in the beginning. The rim diameter varied by forty thousandths. A very large friend of mine was at some show, Jim bell had two boxes of Gibbs brass on his table. He grabbed them and said what do you want for them? Bell said he didn’t want to sell them, my large friend said they’re going home with me and tossed him a hundred. Jamison brass was wonderful as was the bell. I burned lots of WC 860 lit by Federal 215s. A cast 600 grain gas check was my bullet. Used it on bison hunts as backup dealing with bulls.
Had to sell it, recoil was too much for my neck.