>>654814

>Now that i think about it, how is that achieved? Isn't pressure the thing that drives the bullet forward?

Isn't it simply a matter of Boyle's law?

>>654824

I think it does because the reduced volume is increasing the collision rate of the molecules but I'm very unsure.

>>654820

Maybe acceleration but the end velocity should be the same provided the barrel length is appropriate. The energy needs to go somewhere after all.