I don't own a 3.3" Shield 45, but I do own a 3.25" CS45 and a 3.75" 4513TSW. I carry the same loads I was issued at various times over the years, being Winchester RA45T 230gr, Rem HPJ/BJHP 230gr and Federal HST 230gr. A long time ago I also used Speer GDHP 230gr, but it's more expensive and harder to find in my area in recent years.
In older years I used to worry about where a short-barreled .45 would allow a .45 JHP to expand (I carried a Commander and a Star PD as a younger cop). In more recent decades, the big name makers in American ammunition have been offering us some newer bullet designs that are more accommodating of shorter barrels.
I looked and saw I still had pics of an older gel event we hosted at my former agency, by Winchester's Mobile Gel lab, using their prepared organic gel. At that time I loaned my new CS45 to the testing. These were from a couple 4 layer denim test shots, using the standard pressure Ranger SXT and the +P. I don't have my notes at hand, but as I recall the velocities weren't that far apart, and the penetration was similar. The standard pressure is on the left and the +P on the right. I carried the standard pressure, although there was a brief time when the standard pressure RA45T was
really backordered, so we had to accept the RA45TP (+P), which produced more recoil (slide velocity & muzzle whip) than many of our shooters liked. The local W-W LE Distributor sold all the T-Series to cops at individual officer pricing (with ID), and I put back a supply of it in different calibers for a while.
Even the standard pressure RA45T has a bit more snap to it than the other major brand standard pressure 230's, but then it has a bit more velocity, so that's not surprising.
Nowadays I carry either the Golden Sabre, HST or the T-Series.
FWIW, Winchester has again revised the SXT derived T-Series since that earlier gel test, but then likely so have the other major makers revised and tweaked their bullets.
Personally, I quit worrying about the potential for expansion when using any of the major American maker JHP's of modern design (90's & onward), as they're making the stuff intended for LE/Gov sales to the same testing specs. I don't have any info on the other JHP lines marketed to the regular commercial market, as the different makers seem to put a different emphasis on how the commercial JHP's may perform in the standardized LE/Gov ballistic testing. It's not unusual to hear how JHP's designed for the commercial market may not be designed with the same intermediate barriers and testing in mind as those designed for LE/Gov sales.
Suit yourself.
First and foremost is to obtain reliable feeding and functioning, in
your hands, in
your little .45.