My experience is with full-size pistols, and standard

FMJ loads. For SD purposes, I prefer 147 grain, as

bullet speed won't matter, but weight might make a

difference. For target, 124 grain is preferable, for my taste.

115 grain is OK for general practice, and also for distance

shooting.

The S&W 3914 is a fine pistol, but I would experiment, and

see what works best for you. The shorter barrel and lighter

weight are going to shoot differently than a full size gun.