The 40 S&W cartridge lives in that sweet spot between the 9mm and 45 ACP, delivering serious stopping power without sacrificing magazine capacity. But all that performance hinges on choosing the right bullet for your specific purpose – whether you’re loading defensive rounds, practice ammo, or competition loads.
Getting the bullet selection right means understanding how weight, shape, and construction affect everything from feeding reliability to terminal performance. The wrong bullet can cause feeding issues, accuracy problems, or inconsistent expansion. This guide breaks down the best options from proven manufacturers like Hornady, Speer, and Sierra, helping you match the right projectile to your intended use without wasting components on trial and error.
Top 40 S&W Bullet Weights: 165gr vs 180gr
The 165-grain bullet offers flatter trajectory and slightly less recoil, making it popular for competition and faster follow-up shots. It typically runs at higher velocities – often 1100-1150 fps from a 4-inch barrel – which translates to reduced muzzle flip and quicker sight recovery. Law enforcement agencies that adopted 40 S&W often favored this weight for its balance of controllability and effectiveness.
The 180-grain bullet delivers more momentum and deeper penetration, appealing to those who prioritize maximum energy transfer. Velocity drops to around 950-1000 fps, but the heavier projectile maintains energy better at distance and tends to produce more consistent expansion in defensive hollowpoints. For handloaders, 180gr bullets generally show better accuracy in many pistols and offer more powder charge flexibility without hitting pressure limits.
| Bullet Weight | Typical Velocity | Best Use | Recoil |
|---|---|---|---|
| 165gr | 1100-1150 fps | Competition, duty | Lower |
| 180gr | 950-1000 fps | Defense, accuracy | Moderate |
Both weights work reliably in standard 40 S&W chambers, but your pistol may show a preference. Most modern 40 S&W pistols were designed around 180gr loads, so that’s often the best starting point for load development. If you’re chasing faster splits in competition or prefer less perceived recoil, the 165gr options deserve serious consideration.
Best JHP Bullets for Self-Defense Loads
Speer Gold Dot bullets remain the gold standard for 40 S&W defensive reloads, with their bonded core design preventing jacket separation during expansion. The 180gr Gold Dot consistently expands to 0.60-0.65 inches while penetrating 12-15 inches in ballistic gelatin – right in the FBI’s preferred performance window. These bullets feature a uniform jacket electrochemically bonded to the core, which means reliable expansion even through heavy clothing or intermediate barriers.
Hornady XTP (eXtreme Terminal Performance) bullets offer excellent value without sacrificing quality, featuring controlled expansion through their precisely engineered jacket thickness. The 180gr XTP uses serrations and a flex tip design that initiates expansion reliably at 40 S&W velocities. Sierra Sports Master JHP bullets provide another solid option, though they’re more sensitive to velocity – you’ll want to keep them above 950 fps for consistent performance.
When loading defensive JHP bullets, pay close attention to overall cartridge length (OAL) since the wide hollow cavity can complicate seating depth. Most 180gr JHPs work best at 1.125-1.135 inches OAL, but always verify feeding through your specific pistol. Start with published load data and work up carefully, as JHP bullets can generate different pressures than the FMJ projectiles used in many manuals.
FMJ Bullets That Feed Reliably in Any Pistol
Zero Bullets and Precision Delta offer consistently round-nose FMJ projectiles that feed like butter in virtually every 40 S&W platform. The traditional round-nose profile has been feeding semi-automatics for over a century, and it remains the most foolproof choice for practice ammunition. These bullets typically cost 8-12 cents each in bulk, making them economical for high-volume shooting.
Berry’s plated bullets bridge the gap between jacketed and cast, offering cleaner shooting than lead at a lower price than true FMJ. Their copper plating reduces barrel fouling while maintaining the feeding reliability of a jacketed bullet. The 180gr round-nose plated bullet works especially well in 40 S&W, handling velocities up to 1200 fps without plating separation – though most practice loads run considerably slower.
For maximum feeding reliability, look for bullets with a nose profile that measures at least 0.165 inches from the ogive to the tip. Truncated cone designs can work but may require OAL adjustments in some pistols, particularly compact models with shorter feed ramps. If you’re loading for multiple pistols or want one-size-fits-all practice ammo, stick with traditional round-nose FMJ bullets.
Cast Bullets for Budget 40 S&W Practice
Missouri Bullet Company and Bayou Bullets produce quality cast and coated lead bullets that slash your cost per round to 5-7 cents per bullet. Cast bullets in 40 S&W typically use a 0.401-inch diameter, though some pistols with slightly oversized bores shoot better with 0.402-inch projectiles. The key is matching bullet diameter to your specific barrel’s groove diameter for best accuracy and minimal leading.
Powder-coated cast bullets have revolutionized lead bullet shooting, virtually eliminating the leading problems that plagued traditional lubed cast bullets. The polymer coating withstands higher velocities than grease lubes and keeps your barrel cleaner for thousands of rounds. Most coated bullets handle velocities up to 1000 fps without issues, perfect for 40 S&W practice loads in the 900-950 fps range.
Quick Checklist for Cast Bullet Success
- Slug your barrel to determine actual groove diameter
- Start with 0.401-inch diameter bullets for most pistols
- Keep velocities under 1000 fps to prevent leading
- Use published cast bullet load data, not jacketed data
- Check for leading every 200-300 rounds initially
- Clean with copper solvent if leading appears
- Consider powder-coated bullets for cleaner shooting
Cast bullets require slightly different load data than jacketed projectiles because they generate less friction in the barrel. Never substitute cast bullets in loads developed for jacketed bullets without consulting appropriate load data. Start at the minimum listed charge and work up while watching for pressure signs.
Common Mistakes When Choosing 40 S&W Bullets
Using 0.400-inch diameter bullets instead of the correct 0.401-inch size leads to poor accuracy and excessive leading in many 40 S&W barrels. While some competition shooters use 0.400-inch bullets successfully, most factory barrels are cut to 0.400-inch bore with 0.401-inch grooves. The undersized bullet doesn’t properly engage the rifling, allowing gas blowby that accelerates barrel wear.
Seating bullets too deep to save space in the case causes dangerous pressure spikes that can damage your pistol or cause injury. The 40 S&W operates at relatively high pressure (35,000 psi maximum), so even small changes in case capacity affect pressure dramatically. Always start with published OAL specifications and only adjust after confirming safe pressures with your specific combination.
Mixing bullet types without adjusting powder charges creates inconsistent performance and potential safety issues. A 180gr cast bullet and a 180gr JHP may weigh the same, but they behave completely differently in terms of friction, pressure, and velocity. Each bullet style requires its own load development from published data specific to that construction type.
Ignoring feeding tests before loading hundreds of rounds wastes components when your pistol refuses to feed that particular bullet profile. Load 10-20 test rounds at your chosen OAL and manually cycle them through your pistol’s magazine. If you encounter any hesitation or failure to feed, adjust your OAL in 0.010-inch increments until feeding becomes flawless.
- Never use 0.400-inch bullets without testing in your specific barrel
- Don’t seat bullets deeper than published OAL to solve feeding issues
- Avoid substituting bullet types without changing load data
- Test feed reliability before bulk loading
- Don’t exceed maximum velocities for plated or coated bullets
- Never start at maximum powder charges when trying new bullets
FAQ: 40 S&W Bullet Selection and Reloading
Q: Should I use 0.400-inch or 0.401-inch diameter bullets for 40 S&W?
Most factory 40 S&W barrels use 0.401-inch groove diameter, making 0.401-inch bullets the standard choice. You can slug your barrel by driving a soft lead ball through the bore and measuring it to determine your exact groove diameter. Some aftermarket barrels, particularly those made for competition, may use 0.400-inch grooves.
Q: Can I use 10mm bullets in 40 S&W reloads?
Yes, 10mm and 40 S&W use identical bullet diameter (0.400-0.401 inches), so any 10mm bullet works perfectly in 40 S&W. The difference between these cartridges is case length and powder capacity, not bullet size. This gives you access to a wider selection of bullet weights and styles.
Q: What’s the best OAL for 180gr bullets in 40 S&W?
Most 180gr bullets work best at 1.125-1.135 inches OAL, which is close to SAAMI maximum of 1.140 inches. Your specific pistol may prefer slightly different lengths depending on chamber dimensions and feed ramp geometry. Always start with published OAL and adjust only if feeding issues occur, retesting for pressure signs when you change seating depth.
Q: Do I need different load data for plated bullets versus jacketed?
Use jacketed bullet data for plated bullets, but stay in the lower to middle velocity range. Most manufacturers recommend keeping plated bullets under 1200 fps to prevent the copper plating from separating. Berry’s and other quality plated bullets work great with standard 40 S&W practice loads running 900-1000 fps.
Q: Why do some bullets require more powder than others at the same weight?
Bullet shape and bearing surface area affect friction and pressure generation. A long, cylindrical bullet with more surface contacting the barrel creates more resistance than a short, round-nose design. JHP bullets often show different pressure curves than FMJ despite identical weight because the hollow cavity changes how the bullet engages the rifling.
Q: What’s the most accurate bullet weight for 40 S&W?
Most 40 S&W pistols shoot 180gr bullets most accurately because the platform was originally designed around that weight. However, individual pistols can be finicky – some shoot 165gr better, others prefer 200gr. The only way to know is testing multiple weights in your specific firearm with carefully developed loads.
Choosing the right bullet for your 40 S&W reloads comes down to matching projectile construction and weight to your specific purpose. JHP bullets from Speer or Hornady deliver proven defensive performance, FMJ or plated bullets keep practice costs reasonable, and cast bullets slash expenses even further for high-volume shooting. The 180gr weight remains the most versatile choice, but 165gr bullets offer advantages for competition and reduced recoil.
Start with quality components from established manufacturers, follow published load data exactly, and test feeding reliability before committing to bulk loading. Your pistol will tell you what it prefers through accuracy and reliability – listen to it. With the right bullet selection and careful load development, your 40 S&W reloads can match or exceed factory ammunition performance at a fraction of the cost.
