Here's a chart showing XTP performance velocities. Also, Lucky Gunner's 10mm ballistics test. They didn't do a 44 Mag gel test, but did do 10mm in 180gn XTP. Just a WAG but the 180XTP in 44 and 10mm should be similar enough to be very close in performance. Going from the 10mm ballistics that LG did on the 180XTP, I'd say that serger is probably right in the sweet spot with that mid 1100fps 44 load.
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