A few years ago I decided to spend some serious money on a variety of .38 Special cartridges by various ammo makers to see what was most accurate from my S&W models 442, 36 and 60 Pro. What I found was the most expensive SD ammo wasn’t accurate at all from my J frames. The most accurate, Hornady American Gunner, was shown to be a terrible round from a snub nosed revolver according to testing by Lucky Gunner. But I found that a couple of different loads from Federal’s HDT line were also very accurate and performed very well in Lucky Gunner’s testing.
I did something similar with 9mm.
The thing I came away with in both tests was just because some online yahoo blogger, magazine writer touts it, like the Underwood’s Penetrator crap, high price doesn’t mean accuracy performance.
One of the most accurate rounds I tried wasn’t from a 20 round box of wonder bullets at all. It was that Remington green box JHP +P ammo sold at Walmart in .38. Unfortunately I haven’t seen that in a couple of years and it wasn’t part of Lucky Gunner’s test.
There is a lot of good info on this site. Lucky Gunner really did a nice job with this.
https://www.luckygunner.com/labs/self-defense-ammo-ballistic-tests/#9mm