I loaded several hundred rounds of 147gr FP bullets to run in my 5" Pro M&P. Starting at 910 FPS and average PF of 134 and up to 970 FPS and 141 PF I get a really wimpy ejection. Even at 141 PF casings are traveling two to three feet max. At the 135 PF level I start getting stove pipes. I really like the soft feel of 147 but even around 138 PF I've had some jams. Not good to be clearing jams while on the clock.
Any experience with changing the recoil spring when running heavier bullets?

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M&P9, 40, 357, 22, 40 Pro +++