I tried to remove a bulge in a set of A H Fox barrels several years ago by using gauge pins, since it was behind any choke constriction where the bore was parallel. I knew that I couldn't remove that part of the bulge between the barrels, and between the ribs, but I tried to remove what I could. As I was finishing up the "tapping in" on the bulge ...... the top rib popped loose from the thousands of light taps to shrink the bulge with the tiny hammer and shop-made brass drift.
I will never try to remove a bulge again. I like long barrels much more than most but a 28" bulge free barrel is preferred to a 30" one with most of the bulge removed, but a bulge still visible in the bore between the ribs.
JMO, YMMV
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