.40 Super – Ballistics, Ammo, Barrels & Comparison Guide
The .40 Super is a high-pressure, bottlenecked handgun cartridge designed to deliver 10mm Auto–level performance in .45 ACP–sized platforms. Developed in the 1990s, .40 Super pushes lighter .40-caliber bullets at extremely high velocities, offering flat trajectories, deep penetration, and impressive energy.
Although never mainstream, .40 Super remains popular among enthusiasts, handloaders, and custom pistol builders seeking maximum performance from semi-automatic handguns.
🔍 Quick FAQs – .40 Super
What is .40 Super?
.40 Super is a high-velocity handgun cartridge based on a strengthened .45 ACP case necked down to .40 caliber.
Is .40 Super more powerful than 10mm?
In many loads, yes. .40 Super can exceed 10mm velocities with lighter bullets, though both are very powerful.
Is .40 Super still available?
Yes, but it is niche. Ammo and barrels are limited and usually produced in small batches.
Can you shoot .40 Super in a .45 ACP pistol?
Only with a properly supported .40 Super barrel and heavy recoil spring. Never fire it in a standard .45 ACP barrel.
Is .40 Super safe?
Yes—when used in firearms specifically built or converted for it. It operates at very high pressure and is not forgiving of mistakes.
Buffalo Bore Dangerous Game Ammunition 454 Casull 300 Grain Lehigh Mono-Metal Lead-Free Box of 20
In stock
Hornady Black Ammunition 5.7x28mm FN 40 Grain V-MAX Polymer Tip Box of 25
In stock
Underwood Ammunition 40 Super 135 Grain Jacketed Hollow Point Box of 20
In stock
Underwood Ammunition 40 Super 135 Grain Jacketed Hollow Point Box of 20
In stock
Underwood Ammunition 40 Super 140 Grain Lehigh Xtreme Penetrator Lead-Free Box of 20
In stock
Underwood Ammunition 40 Super 220 Grain Hard Cast Flat Nose Box of 20
In stock
Underwood Ammunition 40 Super 220 Grain Hard Cast Flat Nose Box of 20
In stock
Underwood Ammunition 45 Super 185 Grain Jacketed Hollow Point Box of 20
In stock
Underwood Ammunition 45 Super 200 Grain Lehigh Xtreme Penetrator Lead-Free Box of 20
In stock
Underwood Ammunition 45 Super 230 Grain Jacketed Hollow Point Box of 20
In stock
Underwood Ammunition 45 Super 255 Grain Hard Cast Flat Nose Box of 20
In stock
Underwood Xtreme Defender Ammunition 45 Super 135 Grain Lehigh Xtreme Defense Lead-Free Box of 20
In stock
40 Super — High-Speed Loads | Cross-Border Orders Accepted
.40 Super is a high‑performance cartridge that produces increased velocity from common pistol platforms. Primereloaders supplies components for experienced reloaders across the USA & Canada who build high‑speed loads — heavy‑duty brass, large‑pistol magnum primers where specified, and powders rated for elevated pressures. Reloading .40 Super demands strict adherence to published load data and conservative development: use only components rated for the pressure range you intend, and always work up loads slowly while watching for pressure signs. We stock premium bullets and magnum‑capable powders from reputable manufacturers, and provide compatibility guidance for common platforms. Fast cross‑border shipping and bulk options make it easier to source specialized parts. If you’re seeking high‑speed performance, Primereloaders offers the components and technical notes you need for safe, repeatable .40 Super loads shipped across North America.