Hatsan Hatsan .50 Piledriver barrel shortening

I have a .50 Piledriver and I am looking to shorten my barrel also as with a DonnyFL GreatKami (14" long) it's abit on the long side. Chuckhunter took 10" off of his .457 but I thought I saw him later say he wished he only took 6" off. Has anyone else shortened their pile driver barrels (what cal. what length any stat's before and after for FPS/FPE and accuracy ??

Appreciate whatever information that others have experienced.
 
Lost about 150fpe chopping the barrel but is the best thing I could have done to it in my opinion! Made It an easy carry carbine and hunting companion out of Cain pole looking rig! Lol. Have taken several deer out to 80 yards!
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