Cave Dweller said:
This might sound silly, but the gun is going to tell you.
For example, several years ago, the bullet called "the flying ashtray" was supposed to be the hot set-up. So I bought a box of the older aluminum case Blazers in the 200 grain hollowpoint. And they were hot.
My 1911 Colt Enhanced hated them. I actually thought about buying a stronger recoil spring just to better the slide timing.
In the end, a normal 225 grain hollowpoint with a rounded ogive turned out to be the best choice.
My H&K likes SW.40 Golden Sabers. My SIG P-229 eats aluminum Blazer SW .40 hollowpoints like a kid eats candy. Go figure.
I usually buy a pistol, and shoot it with the traditional load for a bit to loosen it up, if that's really possible for something made of metal. In this case, I'd find some traditional FMJ. I happen to like American Eagle 95 grain hardball for this chore. It seems to work in a large number of .380's without a hitch.
If functioning is a severe problem, it goes back to the gunshop. If it simply needs a "reliability package" and better sights, off it goes to Terry.
I hate to say this, but I simply look at my self defense pistols as "tools." I have other toys for a fun day at the range.