Just a question; can modern powders set up a different harmonics in the barrel V 's the old MK VII ammo.
I am just thinking as a load I am working on develops 3,000 psi less than the AR 2209 (Varget) even though it is projected at 2440 fps which is the standard fps for ball ammo.

I realise it is the same fps but if the burn time is faster between the strands verses powder if it gets to the 2440fps quicker does this alter the wave sequence I know the vibration will not get ahead of the projie.

I will explain it this way; say Ball ammo exits the muzzle in 2 mili seconds after ignition and the reloads even though going at the same terminal velocity due to the faster burn rate get to the muzzle in say 1.5 mili seconds will this alter the barrel harmonics and groups ?

Thanks in advance for your thoughts on this
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