Actually, I did this about 2 months ago and was impressed by the velocity gain. I took my 4 in 1936 Luger and my 1917 Arty to the range and fired a few rounds across my ProChro chronograph
( Its always been accurate and repeatable ). The loads were 6.2gr of Power Pistol, 125gr Hornady HAP bullet and Win. primers. The 4 incher was doing around 1180-1190, and the rounds out of the Arty were averaging 1305 !
Now, these loads were made up for my Browning Hi-Power, and are probably a little too stiff for regular use in a Luger, but it does show those extra 4 inches do make a difference.
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