Having a little difficulty following what your trying to communicate to me(us)...
Comparing velocity of two completely different cartridges, with different barrel lengths means pretty much, oh well.....
Barrel #1: 14" 300Whisper
Barrel #2: 24" 300Whisper
I can manipulate the powder charge to make the 14"(#1) out perform the 24"(#2) all day. Even if the powder charge is the same, the projectiles can be manipulated to make #1 look superior....even the seating depth, crimp/no-crimp, number of lands and grooves, twist rate, etc, etc.....
Even two completely indentical cartridges just being chambered in two different barrels(with the same twist rate, lands-n-grooves, length of freebore, length of barrel) can give some very large differences.
Or are you saying that the 300AAC is a better cartridge then the 300Fireball?
Scott
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