I had that there mangrum of mine Mag-Na-Ported back when Larry Kelly was still around...he did it personally. It never has bothered me from high retention or on night firing. Works good on full-house magnums for controlling recoil, but doesn't do much on lower velocity loads. I don't think I'd do porting on a lower velocity .45, .40, or 9mm. Your mileage may vary...greatly.
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That's a very nice port job if I say so myself.