How does a bullet on a revolver get accelerated? Answered
How does the explosive in the round move the bullet?
Is it just a quick bang and the shockwave gives the bullet a quick "kick", letting its momentum carry it down the barrel?
or do the expanding gases continue to push it down the barrel?
If it is the latter, doesn't there need to be a (reasonably) airtight seal between the chamber and barrel to stop the gases just escaping out the sides?