I researched carry guns and selected the PM9 which should arrive in a few days so I'm now into the ammunition. Reading just about everything I can, I am strongly leaning toward Speer Gold Dot 124 grain. I saw the short barrel version which comes only in +P and checked it out finding the following:
Speer® LE Gold Dot® Short Barrel Duty Ammunition
Packing a short barrel once meant less velocity and less reliable expansion. Speer has created an entire category of specialized ammunition designed specifically for back-up guns. Gold Dot Short Barrel was introduced in 2004 and designed from the ground up to work in 2-inch barrels. We redesigned select Gold Dot bullets to make the cavity larger for reliable expansion at the reduced velocities common to short barrel handguns. You also get less "kick" to keep you on target when wielding sharp snapping .357 and .44 Magnum revolvers. And if a semi-auto is your gun of choice, our offerings are ideal for expansion in barrels as short as three inches. Available in 9mm +P, 38 Special +P, 357 Magnum, 40 S&W, 44 Magnum and 45 Auto.
This gets me wanting the SB version but can my PM9 handle it? The Manual I downloaded doesn't say anything beyond only shoot what the gun states. I wouldn't shoot it for practice except for 1 or 2 rounds each trip.