List of muzzle-loading guns

Columns: Caliber ( mm ) | Weapon name | Country of origin | Design
140 | 70-pounder Whitworth naval gun | United Kingdom | 1860s | 160 | RML 64 pounder 64 cwt gun | United Kingdom | 1865 | 160 | RML 64 pounder 71 cwt gun | United Kingdom | 1870 | 160 | RML 6.3 inch Howitzer | United Kingdom | 1878 | 178 | RML 7 inch gun | United Kingdom | 1860s-1890s | 191 | Widow Blakely | Confederate States of America | 1861 | 203 | RML 8 inch gun | United Kingdom | 1866

Example questions:
What is the muzzle-loading caliber of the weapon that was used extensively in the American Civil War ? | What is the muzzle-loading caliber of the weapon that was an artillery system designed to implement rifled muzzle-loading guns in the French Army ? | What is the muzzle-loading caliber of the weapon that is field artillery in the American Civil War ? | What is the muzzle-loading caliber of the weapon that was manufactured between 1861 and 1862 during the American Civil War ? | What is the muzzle-loading caliber of the weapon that was primarily used by the Indian Army ?

Answers:
73 | 86 | 76 | 96 | 64