Posted by Klay on Mar 24th 2025

+P Ammo and Micro Handguns: What You Need to Know

Many shooters are curious whether it's safe to run +P ammunition through micro-compact handguns like the Sig P365—especially when using True Precision barrels. The answer is yes: True Precision P365 barrels are tested and rated for use with factory new, SAAMI spec +P ammo from reputable manufacturers.

While it's true that hotter ammo can increase felt recoil and accelerate wear on small parts, it's important to understand the nuance behind +P ammunition, especially when used in micro pistols designed for concealed carry and defensive applications.

Is +P Ammo Safe in the P365?

Yes, it is. All True Precision P365 series barrels are rated for +P factory ammunition loaded to modern SAAMI standards. During development, True Precision extensively tested leading defensive loads to ensure both performance and safety.

However, ammo labeled +P+ or ++P (often exceeding 38,500 PSI) is not the same as standard +P. These “super hot” rounds are not SAAMI rated, and the lack of pressure regulation makes them unpredictable. Because of this, True Precision does not recommend using +P+ or ++P ammo in micro handguns. These rounds are better suited to full-size pistols with reinforced chambers and thicker barrel walls that can handle the stress.

Other Considerations with +P in Small Guns

Not all ammo is created equal. Even if it’s marked +P, quality matters—not just the manufacturer, but the components used (primers, casings, powder consistency, etc.). For that reason, True Precision does not recommend reloads or off-brand ammunition from unknown sources.

Using well-made, factory new defensive loads ensures that you're getting ammo that is both safe and consistent. This matters even more in a compact platform like the P365, where every round counts and reliability is paramount.

Trusted +P Loads for the True Precision P365 Barrel

Through extensive testing and customer feedback, True Precision has found the following +P loads to be safe and reliable in the P365 barrel lineup. These rounds deliver excellent performance, clean cycling, and tight groupings across various barrel lengths.

Heavily Tested and Recommended +P Loads:

Federal HST 124gr +P & 147gr +P
Federal Solid Core Syntech 147gr +P
Speer Gold Dot 124gr +P
Hornady Critical Duty 135gr +P
Winchester Defender Bonded 147gr +P
Sig Sauer M17 V-Crown 124gr +P
Sig Sauer M17 NATO FMJ 124gr +P

These loads were chosen not only for reliability and pressure consistency, but also for how they perform in True Precision barrels—with smooth feeding, clean ejection, and repeatable accuracy.

Final Thoughts: Run +P with Confidence—The Right Way

When it comes to +P ammo in micro handguns, the key is quality components and a well-tested platform. True Precision barrels for the P365 series are designed with proper chamber support, precise machining, and materials capable of handling increased pressures without sacrificing performance.

Whether for everyday carry or personal defense, you can confidently run the recommended +P loads through your True Precision P365 barrel, knowing they’ve been tested for both safety and performance.