Hi Squatty,
Glad you joined us. Please pardon my late reply, but I've been away for a week.
So, my little brother got a 3913 a couple of years ago - almost identical to your gun, but with a little more polish and a lot more price.

After consulting with a highly regarded S&W police armorer here on the forum, I wound up recommending that he use the Speer Gold Dot 124-gr +P ) standard-barrel hollowpoints . . .
after he try them out and ensure that they functioned flawlessly. They did, and that's what he's using. I think he's in good shape.
After that, though, Speer brought out the Gold Dot 124-gr +P
short barrel hollowpoints. In a perfect world, I'd try both variants through
my gun, and see which gave better performance (assuming that both gave flawless function and good accuracy) in terms of velocity, and decide based on that. (I should disclose that I find the new short-barrel loading to work amazingly well in my 3.0"-barrelled CZ RAMI, and that's what I carry in it . . . but that gun has a shorter barrel than yours.)