I don't think there is that much difference in what everyone is saying. I think all he is stating is that not ALL burning is done at peak pressure, most, yes. Here is a picture of a 223 graph that includes bullet movement and velocity.

[Linked Image]

It definitely indicates there is still a small amount of burning past peak psi. Once the bullet has moved about three inches the volume of the combustion chamber (case + barrel behind bullet) has nearly doubled, yet the pressure has clearly not halved (actually only about a 20% drop) so something has to be happening. Clearly, this is only one example so take it for what it's worth. If the pressure graph showed the pressure dropping much more dramatically (as JB has stated he has obseved numerous times) that would certainly indicate a more complete burn at peak pressure. Time to go watch some gameday!

Last edited by prm; 09/26/09.