Originally Posted by OKFC05

My experienced with the various weights in the M&P 5" Pro showed no advantage with the 147gr, and the 124gr was only slightly better than the 115gr in accuracy with Precision Delta bullets.

When firing all loaded to the same power factor (PF), the 147gr showed incipient instability at long range, making me believe I needed a little move speed. In general, the longer the bullet, the slower the twist, and the lower the speed, the more likely to go unstable.

At distances up to 35yards, I saw no practical difference, and chose to use the 124gr. I know several competitors who use the 147gr for slightly less recoil impulse (at the same PF). Some are using faster twist aftermarket barrels. YMMV

If I remember correctly, the M9 Beretta that FCUSN1 has, above, comes with a barrel rifled 1 turn in 250mm (about 10 inches) which makes it more suitable for the longer bullets than the slower twist S&W.