I doubt if that date can be specific. I believe it was Marco Polo who first brought the recipe for gunpowder back to Europe from his (?initial?) voyage to China although it may have occurred earlier through a land trip to China from eastern Europe. I also recall that the Chinese used the explosive substance for fireworks-type display only, negating their 'invention' of 'gunpowder'.. If that is so, then your answer probably lies 'within the first 50 years that the powder was in Europe', roughly, the latter 13th century to the middle of the 14th century. This, specifically, would have been the original 'blunderbuss' which is considered the predecessor to the shotgun. The shotgun as we know it, today, would have developed in an evolutionary manner from this weapon.
The black powered gun was first and it shot shotgun slugs but the pistol was the first gun ever invented
John Browning invented the pump shotgun in the year 1897.
The first recorded use of the word shotgun was in Kentucky in 1776, however fire arms that functioned as what we now call shotguns predate that by centuries, having been used before the cast bullet was invented.
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it was the holy grail of 1901
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John Moses Browning. The Browning Superposed was the first practicle over, under shotgun
what year was the first billy car invented
Airplanes were first invented in 1903.
1115 is when the first gun was invented
The first 28 gauge shotgun on the commercial market appeared in 1904. It was made and sold by the Parker Arms Company.
The first Plastic to be invented was CELLULOID in 1868