Handgun Ammunition — Calibers, Bullet Types & Choosing the Right Load
Handgun ammunition selection comes down to two decisions: caliber and bullet type. Get both right for your specific use case and the ammunition works. Get either wrong and you are either overpaying, underperforming, or carrying ammunition that does not expand reliably in the conditions you will actually encounter.
Caliber selection: 9mm Luger (9x19mm) is the dominant defensive and practice caliber in 2026 for reasons that are data-driven rather than preference-based. The FBI's 2015 return to 9mm after years on .40 S&W was based on extensive ballistic testing showing that modern 9mm JHP ammunition performs comparably to larger calibers in terminal performance while offering higher magazine capacity and lower recoil. Federal HST, Speer Gold Dot, and Hornady Critical Defense in 9mm +P and standard pressure configurations consistently meet or exceed the FBI's 12-18 inch penetration standard in ballistic gel testing. The practical advantages — 15-17 rounds in a full-size pistol versus 10-13 for .40 S&W or 8-10 for .45 ACP, combined with lower recoil for faster accurate follow-up shots — have driven 9mm's dominance in law enforcement and civilian defensive use.
.38 Special remains the dominant revolver caliber and the most widely stocked revolver ammunition in the country. In +P loading from a 4-inch barrel, quality 158-grain JHP loads deliver adequate terminal performance for defensive use. The caliber's lower pressure and velocity compared to .357 Magnum make it significantly more comfortable to shoot in lightweight J-frame revolvers. .357 Magnum out of a 4-inch barrel generates approximately 540 ft-lbs of muzzle energy with standard 125-grain loads — substantially more than .38 Special +P — at the cost of sharper recoil and increased muzzle blast. For .357 Magnum revolvers, many experienced carriers load .38 Special +P for everyday carry and reserve full-power .357 Magnum for outdoors and hunting use.
.45 ACP retains a loyal following despite the ballistic data supporting 9mm. The large-diameter .45 bullet does produce a larger wound channel from non-expanding ammunition — relevant for states that restrict hollow point carry, where .45 ACP FMJ performs better than 9mm FMJ at terminal performance. In expanding ammunition, the performance difference between modern .45 ACP and 9mm JHP is marginal at defensive distances. For 1911 platform shooters and buyers with a specific preference for the larger caliber, .45 ACP quality JHP loads from Federal, Speer, and Hornady perform reliably.
Bullet type selection: For defensive carry, use jacketed hollow point (JHP) ammunition specifically designed and tested to meet the FBI 12-18 inch ballistic gel penetration standard. Federal HST, Speer Gold Dot, and Hornady Critical Defense/Critical Duty are the three most widely validated defensive loads across all common handgun calibers. For range training, full metal jacket (FMJ) is the cost-effective choice — it does not expand, which is appropriate for target practice, and it is available in bulk quantities at significantly lower cost per round than JHP. Never carry FMJ for defensive purposes if JHP is legal in your jurisdiction — the non-expanding bullet's penetration characteristics are less controllable in a defensive scenario.
For a detailed comparison of FMJ vs hollow point performance, see our FMJ vs hollow point guide. For the best 9mm ammunition by use case, see our best 9mm ammo guide. For state-specific restrictions on hollow point ammunition, see our ammo and magazine laws page.
Handgun Ammunition Frequently Asked Questions
What is the difference between FMJ and hollow point ammunition?
Full metal jacket (FMJ) bullets have a lead core fully enclosed in a harder metal jacket. They do not expand on impact and penetrate deeply in a straight line. FMJ is the standard for range training — it is inexpensive, accurate, and does not clog semi-automatic feed ramps. Hollow point (JHP) bullets have a cavity in the nose that causes the bullet to expand when it hits a soft target, increasing the wound channel diameter and typically stopping penetration within the target. JHP is the standard for defensive carry — expansion transfers energy more efficiently and reduces the risk of over-penetration. Use FMJ for practice, JHP for carry. For a detailed breakdown, see our FMJ vs hollow point guide.
What is the best 9mm defensive ammunition?
Federal HST, Speer Gold Dot, and Hornady Critical Defense are the three most widely validated 9mm defensive loads in 2026. All three consistently meet the FBI's 12-18 inch ballistic gel penetration standard across multiple barrier conditions. Federal HST 124gr +P and 147gr standard pressure are the most widely carried loads in law enforcement agencies that use 9mm. Speer Gold Dot 124gr +P is the preferred load of the NYPD and numerous federal agencies. Hornady Critical Defense 115gr uses a polymer-tipped FTX bullet designed to prevent hollow point clogging through heavy clothing. Any of these three in the weight and pressure appropriate for your specific pistol will perform reliably in a defensive scenario.
What does +P mean on ammunition?
+P designates ammunition loaded to higher-than-standard pressure, producing higher muzzle velocity and energy. SAAMI standard pressure for 9mm Luger is 35,000 psi; 9mm +P is loaded to approximately 38,500 psi. The additional pressure increases velocity by roughly 50-100 fps depending on barrel length. +P ammunition is safe in any modern pistol explicitly rated for +P by the manufacturer — most full-size and compact 9mm pistols from quality manufacturers are rated for +P. It is not recommended for older or lighter subcompact pistols unless the manufacturer specifically approves it. Never use +P+ ammunition (a non-SAAMI designation used by some manufacturers) in pistols not specifically rated for it.
Is hollow point ammunition legal everywhere?
At the federal level, hollow point ammunition is completely legal for civilian purchase and carry. At the state level, New Jersey restricts hollow point carry outside the home — civilians in New Jersey may purchase hollow points but may not carry them in public. Several other states and municipalities have attempted to restrict hollow points but most such restrictions have not survived legal challenges. Always verify your specific state and local laws before purchasing hollow point ammunition for carry. For state-specific ammunition restrictions, see our ammo and magazine laws guide.
How much handgun ammunition should I keep on hand?
A practical baseline for a defensive handgun owner: 200-500 rounds of your carry defensive load and 1,000-2,000 rounds of FMJ practice ammunition. The defensive load supply ensures you have enough to function test any new carry ammunition and rotate your carry rounds periodically. The practice supply supports regular training without requiring constant reordering. For buyers who shoot regularly, 5,000 rounds of practice ammunition on hand eliminates the price volatility and availability issues that have periodically affected the ammunition market. Buying in bulk from reputable retailers when prices are reasonable is consistently more economical than buying small quantities on demand.