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Changing the powder or charge changes the velocity. That's the action that the rifle is reacting to, if you want to be all Newtonian.

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Its part of the formula. The powder charge or gases are moving forwards therefore there must be a corresponding rearward reaction. As for the physics, don't ask me.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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