All these posts and nobody has mentioned the twist issue?

When the .40 S&W was introduced, twist rate was 1:16.

Glock pistols are twisted about 1:10 (I think it is actually 1:9.85 but would have to look it up).

That is a pretty big difference.

So, if you were a bullet designer, would you design it to work in the slow or fast twist? Would you print that information on the box?

Add in the "midrange loads" vs. "Full loads" with the twist issue and the whole thing becomes complicated.

Yes, good .40 loads exist. Finding them requires testing and understanding the velocity and twist issues.

I am unaware of any other contemporary handgun caliber that shares this issue but would be interested to know if any of you do.