I recently got a browning B78 that is in great condition. I didn’t notice in until I received the rifle , that there are no barrel stamping as to maker or caliber of the barrel. Obviously re barreled at some point. I checked with Browning and they tell me it was made in 1973 but don’t see a caliber listed. The rifle is now chambered in 338 win mag. , that is what it was advertised as and a spent cartridge fits. Browning say they didn’t offer a 338 in Winchester or Browning 1885’s or B78’s. Don’t know if this was a custom build or someone just thought is would be good idea. I am now a little nervous about how safe to shoot. The only stamp on the barrel is under the fore stock hanger. Stamped 107. Any of you folks got any opinions on what I do next?