You don't. Even if you barrel says ".691" for example, that just means it over-bored, or larger then the paintball slightly, just use regular paintballs.
No, it will not break paint. "Underboring" (using a barrel with a smaller bore than the paintball), is a thing used to gain maximum efficiency and consistency from a paintball marker, since no air is escaping around the paintball, and the same amount of air is pushed against it every time.
2.136283 inches
His .50 calibre revolver was based on a Crosman 3357 .50 calibre paintball revolver.
Nominally, whatever size the bore of the musket is, although musket balls were usually considerably smaller than the bore in order to reduce powder fouling in the bore. The British Brown Bess was .75 calibre (but fired a .71 calibre musket ball), the French Charleville musket was .69 calibre (these were also commonly used by what would become the United States during the American Revolution), the smoothbore Springfield Muskets were .69 calibre, while the rifled muskets were .58 calibre... just to put a few out there.
The Charlville musket was in use from 1717 until 1840. It was .69 calibre and had a flintlock firing system.
95 is the highest calibre for a bullet
Calibre One was created in 1999.
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The velocity depends on the precise firearm, not the calibre.
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for a rifle it is thought to be a .50 calibre but a gun company made there own for there own sniper rifle the .408 calibre
The purpose of a paintball gun is to fire paintball pellets, to mark opponents in the game of paintball.