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The ejection of a rimmed shell from a Mosin-Nagant rifle is primarily dependent on the manual action of the shooter operating the bolt. The force and speed of ejection can vary based on factors such as the shooter's technique, the condition of the rifle, and other variables.

When a shooter operates the bolt after firing a round, the extractor mechanism engages the rim of the spent cartridge case, pulling it backward and out of the chamber. As the bolt is cycled fully rearward, the ejector mechanism strikes the rim of the cartridge case, applying force to propel it out of the ejection port.

The speed and force of ejection can be influenced by several factors, including the strength and speed of the shooter's bolt manipulation, the condition of the extractor and ejector mechanisms, and the overall smoothness of the rifle's action.

It's important to note that the ejection of rimmed shells from a Mosin-Nagant rifle is not typically known for being exceptionally forceful or high-velocity compared to other firearms. The ejection process relies on mechanical operation rather than gas or recoil-driven systems found in some semi-automatic firearms.

If you require more specific data regarding the force or speed of ejection for a Mosin-Nagant rifle, it would be advisable to consult detailed technical specifications or conduct specific experiments or measurements with specialized equipment.