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Old April 20, 2013, 11:32 PM   #48
Samopal
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Join Date: November 24, 2008
Location: Michigan
Posts: 8
BBTI backs up my claim fairly well: http://www.ballisticsbytheinch.com/megraphs/45auto.html Note the steep downwards trend once you hit 4".

Likewise compare individual tested loads: http://www.ballisticsbytheinch.com/45auto.html

I certainly see a 20% drop in muzzle energy from 5" to 3" as "plummeting", especially compared to other cartridges that hold their velocity better in short barrels, like the .357 SIG.
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