The best 380 blowback is....
I have owned or shot many of the guns mentioned.
I think that the SIG 232 is the best all around .380ACP Double/Single action pistol.
It has a superb trigger and sights (mine has night sights), terrific ergonomics with a perfectly shaped grip for my hand (this is the base aluminum framed model) and a very safe manual of operation. The hard plastic grip has a palm swell that fills my hand.
The SIG hammer dropping system with a side mounted lever is the best method to drop a cocked hammer to me. Yes, you can drop a hammer with the slide mounted safety on the BERETTA, WALTHER PP series or BERSA clone of the WALTHER pistols, but then your gun is on safe and you have to remember to flip back to the SAFETY OFF position. With the SIG, press the lever down and you are ready to go. The safety is off.
I rate the BERETTA 84 and 85 a very close second and if size is not an issue, the BERETTA pistols may be the better choice, especially the BERETTA 84.
Again, excellent trigger, sights and grips and the open topped slide may make the BERETTA the more reliable design. My BERETTA 84 is the only .380ACP pistol that I know of that will feed the .380 Hydra Shok ammo with complete reliability.
I have also shot the COLT .380 GOVERNMENT model and it is quite a nice shooter, but is handicapped by being a single action only gun. It is accurate and the sights are not bad, but I sold mine.
Since the SIG 238 is almost a copy of the COLT, I would say the same negatives apply to the SIG.
The same negatives apply to the great pair of pistols in .380ACP designed by John BROWNING, the COLT 1908 and BROWNING/FN 1910/1922. Both of these guns are great shooter and the COLT is completely overbuilt for this round. The BROWNING 1910/1955 pistols are much smaller and designed for concealment.
Both of these guns shoot well and are accurate, but are single action style pistols in which you cannot drop the hammer on a live round and much be carried with the safety on or the chamber empty.
The CZ 83 in .380ACP is a great pistol, with one glaring flaw to me, the safety. The CZ 83 enjoys many of the good features of the BERETTA 84 like a very smooth trigger, good accuracy and sights with low recoil.
While the BERETTA and SIG use aluminum to keep weight down, the CZ is all steel and very strong. The negative is it is heavy for this group.
The safety on the CZ is a frame mounted 1911 style safety, so once you have racked a round into the chamber, you are stuck with a cocked hammer and no way to lower it, except by pulling the trigger and lowering it with your thumb. This a an accident waiting to happen as far as I am concerned.
If someone disagrees, I do not care, I have seen pistols fired inadvertently when someone is trying to lower a cocked hammer.
For me, a decocker is the only way to go with Double/Single action pistol.
The WALTHER PPK are excellent pistols that suffer from an older design. My PPK is a .32ACP and has proven absolutely reliable, but it is a pre-war model made by WALTHER.
The INTERARMS models had a mixed reputation for reliability and in the samples that I examined, the action was very gritty.
The S&W made model that I examined had a longer tang to prevent slide burn on the shooters hand and a much smoother trigger.
The narrower grip on the PPK will cause the shooter to perceive more recoil than on the hand filling grips of the SIG, BERETTA and CZ designs. I found that my .32ACP PPK kicked about the same as my .380ACP SIG 232. That was the perception caused by the small grip area of the PPK.
My WALTHER PP in .32ACP was about the size of the SIG 232, but heavier with an all steel frame. However, it recoiled worse that the PPK or SIG because the PP has a slab sided grip with a squared off grip form. The PPK has a different grip shape than the PP or PPK/S, it is rounded off at the web area.
Since the PPK was easier to shoot and was smaller, I sold the PP.
I now carry a GLOCK 42 as my off duty gun. It is a terrific .380ACP, very compact, accurate with good sights, trigger and mild recoil. However it is a locked breech weapon.
Also, I have shot the 9m.m. x 18 ULTRA round and it works fine in a steel framed SIG 230, but I would not re-chamber an aluminum framed 232 to the 9x18 round. If SIG offers the choice, great, but you might end up with a weak gun for the chambering, if you rechamber it.
You can get the same or nearly the same performance out of some of the boutique ammo companies using their high velocity ammo. Companies like COR BON and BUFFALO BORE offer +P style ammo for the .380ACP. The price for this is increased recoil and muzzle blast.
Hope this helps,
Jim