.40 S&W vs .45 ACP: Ballistics, Stopping Power & Best Carry Choice
.40 S&W is a 10×22mm pistol round developed by the FBI in 1990; .45 ACP is a 11.43×23mm cartridge John Browning designed in 1904 for the 1911. Both are center-fire, but the .40 is lighter and faster, the .45 heavier and wider.
Shoppers at the gun counter often mutter “Which one drops a threat faster?” because Hollywood and YouTube mix slow-motion gel tests with loud muzzle flashes, making the two cartridges feel interchangeable when they’re not.
Key Differences
.40 S&W sends a 180-grain bullet at 1,000 fps, delivering 400 ft-lbs in a flatter trajectory. .45 ACP pushes a 230-grain slug at 830 fps for 355 ft-lbs but makes a 0.45″ hole and penetrates deeper. Recoil is snappier with .40, gentler push with .45. Magazine capacity favors .40 by 2-3 rounds.
Which One Should You Choose?
For concealed carry, pick .40 S&W in a compact if you want more rounds and flatter flight. Choose .45 ACP in a full-size if you prefer a wider wound track and softer recoil impulse. Match ammo to reliable pistols you’ll actually train with.
Does .45 ACP always stop better?
Shot placement matters more; both rounds perform similarly with modern hollow points.
Can a novice handle .40 recoil?
Yes, with proper grip and frequent dry-fire practice; start with 165-grain loads.
Is .40 cheaper to shoot?
Marginally; expect 2–4 cents per round savings over .45 ACP when buying in bulk.