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Old May 5, 2013, 10:55 AM   #16
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Join Date: October 8, 2006
Location: Northern Michigan
Posts: 2,772
Almost all BP revolvers are designed with an opening smaller than the rear of the chamber.
No, they aren't.
The smaller opening, causes the ball to be squeezed and compressed into the cylinder. Causing a friction fit.
IF the openings were actually smaller than the throats, which they aren't, the ball would be swaged to the diameter of the opening and then be LOOSE further down inside the chamber where the diameter would be larger. Lead balls don't expand to fill up the extra space available in a larger diameter cylinder. There would be no 'friction fit' because the ball diameter would be smaller than the diameter of the cylinder throat. Because the loose ball would not seal the chamber, expanding gas would escape around the ball resulting in low velocity.
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