[Sashi]

Originally Posted by marxman

If by net muzzle pressure you mean average barrel pressure I don’t know why you call it muzzle pressure. But I know from pistol carbine rounds if you load powders of different burn rates to the same velocity the slower powder will require a bigger charge and has more report because of the higher muzzle pressure even for the same speed. Of course the bigger charge has produced more gas for the same barrel volume it’s a bigger bang at the muzzle without producing higher velocity. For some reason the faster charge has accelerated the bullet more efficiently and the higher muzzle pressure of the bigger slower charge means wasted energy not more velocity in this instance

At the muzzle, both Muzzle pressure and Average barrel pressure are Equal.