I'm a Ruger man.
That little puff before the bullet leaves the barrel...
This is just a cool slo-mo pic
Burn time? Short!
I've always thought that when the powder STARTS to burn and has made
enough pressure to unseat the bullet, the pullet would pop out of the case
and STOP at the forcing cone (revolver) or when it meets the lands (auto)
until pressure goes high enough to force the bullet into the rifling.
Anyone who has ever slugged a barrel knows how much force that takes.
So in the GIF above there is that little puff of smoke coming out before the
bullet, which could be gasses leaking around the bullet as it is stuck on the
I can't think of any other explanation for that happening.