Home Forums Hunting & Shooting Express Rifles and Big Bores Only Is 375 where big bore starts?

In the day a 450 blackpowder or even a 577 blackpowder express was not a bigbore. It was the medium for usually non serious stuff. Anything under an 8 or heavily loaded 10 bore didnt get classed as big whatsoever. Obviously what fellas talk about as big had to change when smaller nitro expresses hit the gamefields. That said there were references even to 450nitro class as large medium bores at first. Anyone drawing a 'hard fast bore size' rule for any of this doesnt understand history.