2 bore

Specifications
The Two Bore or 2 Bore is a mostly obsolete firearm caliber.

The historical two bore fired spherical balls or slugs of hardened lead or, in the modern metallic cartridge, additionally a solid bronze projectile. The gauge is 1.32 in, and the projectiles generally weigh 8 ounces (225 grams; 3500 grains). The velocity is relatively low, at around 1500 ft/s at the muzzle, but hits with approximately 17500 ft.lbf of energy.

History and Background
The largest size ever created for a shoulder rifle, and used mainly in the 19th century for hunting large and potentially dangerous game animals, this caliber was used by the European hunters, notably the British, in tropical climates of Africa and India. Meant to be used with black powder due to its size, it was unpopular due to the problem of thick smoke and excessive recoil. The rifle was meant to be fired from the shoulder by one person; larger guns existed, such as the punt gun, but these were only fired supported and generally from a prone position. Sir Samuel White Baker, a notable British explorer and hunter of the Victorian era, was impressed by its power, but he heavily disapproved of the recoil. He narrates dashing adventures with his two-bore rifle, which he affectionately referred to as "Baby":

"Among other weapons, I had an extraordinary rifle that carried a half-pound percussion shell; this instrument of torture to the hunter was not sufficiently heavy for the weight of the projectile: it only weighted twenty pounds, thus with a charge of ten drachms [270 grains] of powder and a HALF-POUND shell, the recoil was so terrific, that I spun around like a weathercock in a hurricane. I really dreaded my own rifle, although I have been accustomed to heavy charges of powder and severe recoils for some years. None of my men could fire it, and it was looked upon as a species of awe, and it was name 'Jenna-El-Mootfah' (Child of a Cannon) by the Arabs, which being a far too long of a name for practice, I christened it the 'Baby', and the scream of this 'Baby' loaded with a half-pound shell was always fatal. It was too severe, and I seldom fired it, but it is a curious fact that I never shot a fire with that rifle without bagging. The entire practice, during several years, was confined to about twenty shots. I was afraid to use it, but now and then as it was absolutely necessary, it was cleaned after months of staying loaded. On such occasions my men had the gratification of firing it, and the explosion was always accompanied by two men falling on their backs (one having propped up the shooter) and the 'Baby' flying some yards behind them. This rifle was made by Holland & Holland, of Bond Street, and I could highly recommend it for the Goliath of Gath, but not for the men of A.D. 1866."