I got an old 16 ga Topper I've had for years and don't shoot anymore. Barrel was shortened due to a bulge. Anyway is it possible to fit a barrel in a caliber with an except-able pressure for the receiver or am I looking for trouble? Never messed with these before but have done a bit of work on side by side shotguns and built(rebarrel , recontour bolts and actions) a few mausers so was curious. Thanks Scott