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<blockquote data-quote="NikatKimber" data-source="post: 804768" data-attributes="member: 423">Rod&#039;s pretty much got it.I&#039;ll see if I can explain it slightly differently.The velocity of the bullet depends only on the amount of energy expended on it during its time in the barrel.However, for a brief period after, if the propellant has not completely burned up, the pressure inside the barrel will not instantly go to zero. Think rocket here. Now I&#039;m not familiar enough with pistol powders to know if they mostly burn completely or not. But, given what you are saying, similar velocity, but more felt recoil from the slower powder, sounds to me like it is not burning completely before the bullet leaves the barrel.So the faster powder is burning completely, achieving the velocity with no extra energy being wasted. Where the slower powder is still burning, thus releasing energy, after the bullet has left.</blockquote>

[QUOTE="NikatKimber, post: 804768, member: 423"] Rod's pretty much got it. I'll see if I can explain it slightly differently. The velocity of the bullet depends only on the amount of energy expended on it during its time in the barrel. However, for a brief period after, if the propellant has not completely burned up, the pressure inside the barrel will not instantly go to zero. Think rocket here. Now I'm not familiar enough with pistol powders to know if they mostly burn completely or not. But, given what you are saying, similar velocity, but more felt recoil from the slower powder, sounds to me like it is not burning completely before the bullet leaves the barrel. So the faster powder is burning completely, achieving the velocity with no extra energy being wasted. Where the slower powder is still burning, thus releasing energy, after the bullet has left. [/QUOTE]

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