Good choice.
Caliber doesn't matter, but a reliable design does. Spending a lot of money on functionality testing is required with any auto. A box or less of ammo will will tell you what you need to know about a revolver.
Ballistically, the .38 is superior in almost every way.
Agreed.
Reliability testing is important.
With a semi auto that normally involves 200 rounds of your intended carry load, with no malfunctions using all the magazines you intend to carry.
.380 ACP pistols in general can be un reliable with hollow points. The Walther PP series and their numerous FEG clones in particular are very hit and miss from model to model, pistol to pistol and from hollow point type to hollow point type.
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With a revolver the main concerns are:
- light strikes (especially with a lighter hammer springs to reduce the DA trigger pull); and
- the bullet backing out of the case under recoil. If it gets out in front of the cylinder it will lock the revolver cylinder. I'll test for this by leaving a round in the cylinder for 12 or so shots and ensuring it's OAL doesn't increase and repeat it with 3-4 different rounds.
Another concern is large unburnt powder grains that can get under the ejector star abs prevent a reload, but that's more of a concern with colloidal ball powders used in .357, .41 and .44 magnum loads.
Timing can also be an issue in DA fire, as the cylinder can stop during a slow DA pull.
However as noted above a box of ammo is generally enough to verify that none of those issues are present.
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From a terminal ballistics perspective, many of the shorter barrel .380 ACP pistols will not generate enough velocity to get consistent expansion and adequate penetration with many hollow points. Many shooters just opt to use FMJs, although .380 ACP hollow points and loads have improved to the point that good hollow point performance is possible, provided tou you match the hollow point to the gun and the velocity it generates. .380 ACP hollow points have very narrow velocity envelopes where they perform well and can meet FBI standards for expansion and penetration.
The Hornady 90 gr XTP performs well, but only if you can get 1000-1050 fps out of the pistol. That's very tough to achieve in a 2.85" barrel but is much more obtainable in a 3.5"-4.0" barrel.
90 gr Sig V-crowns will expand well around 850-900 fps and give 12"-13" penetration but will under penetrate at higher velocities.
90 gr Hornady critical defense also gives 12"-13" penetration at around 900 fps but will also under penetrate in a longer barrel at higher velocities.
All the federal, Remington and PMC loads I have gel tested failed to consistently expand and over penetrated.
Now…that's not all bad as while for example the 102 gr Golden Sabers might only expand 40% of the time, you get good performance when they do expand, and they perform like an FMJ with plenty of penetration when they don't.
The 90 gr Speer Gold Dots, 85 gr Win silver tips, 95 gr MagTech, Winchester 95 gr PDX 1 and the Win train and defend loads all consistently expand well but under penetrate. I can live with 11" from a gold dot, but 8" from the MagTech or train and defend loads are just not acceptable to me and FMJ is a better choice than those under penetrating loads.
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If you hand load you have a lot more control over velocity but you definitely need a chronograph and I'm personally only comfortable with a load after I have gel tested the load in my carry gun(s). Not many folks are willing to invest tiphe time or money into gel testing.
Hollow point bullet options are limited to the Hornady XTP, Sig V-crown, and Speer Gold Dot plus various old tech bulk rounds that perform like FMJs.
Berrys and Xtreme both make hybrid hollow points designed to expand for self defense purposes. So far I have not been impressed with the Berry's bullets as they over expand ans or fragment and under penetrate. However I've gotten much better results from the Xtreme bphollow points in .380, 9mm and ,45 ACP. The velocity envelopes are very narrow, it within their envelops performance is superb and they are very cost effective.
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.38 Special can have similar terminal performance issues. However I've gotten good results in 2-3" barrels with 125 gr Remington Golden Sabers (particularly the +P loads), and the Winchester 130 gr gr +P loads.
The 110 gr Hornady Critical Defense does well in a 2-3" barrel but the 90 gr lite loads consistently under penetrate.