What's the difference?
FMJ (Full Metal Jacket) is a lead bullet enclosed in a copper jacket. It punches clean holes, doesn't expand, and feeds reliably in any firearm. This is your range and training ammo.
Hollow point (JHP) has a cavity in the tip designed to expand on impact. Expansion creates a wider wound channel and slows the bullet down, reducing the risk of over-penetration. This is your self-defense and carry ammo.
The distinction matters because using the wrong type for the job either wastes money (carrying FMJ for defense) or creates liability (FMJ over-penetrates through walls and people).
Construction and how they work
FMJ
A lead core jacketed in copper or copper alloy, covering the nose and sides (most FMJ designs leave the base exposed despite the name). On impact, FMJ rounds stay intact and punch straight through soft tissue. They don't expand, which means they create a narrow wound channel and penetrate deeply — often too deeply for defensive purposes.
FMJ is the standard military ball ammunition. (Military use of expanding bullets is restricted by the 1899 Hague Convention, but no such restriction applies to civilian or law enforcement use.)
Hollow point (JHP)
A lead core with an exposed hollow cavity in the nose, sometimes filled with a polymer tip (like Hornady's FTX or Federal's HST). On impact, hydraulic pressure from tissue or gel forces the cavity open, mushrooming the bullet to 1.5–2x its original diameter.
This expansion does two critical things: it transfers more energy into the target (increasing wound effectiveness), and it slows the bullet so it's less likely to exit and hit something behind the target (reduced over-penetration).
Modern JHP designs from Federal HST, Speer Gold Dot, and Hornady Critical Duty are engineered to expand reliably through heavy clothing, auto glass, and drywall while still meeting the FBI's 12–18 inch penetration standard in calibrated ballistic gel.
Cost comparison
Hollow points cost 2–5x more than FMJ in the same caliber. Here's what to expect:
| Caliber | FMJ (per round) | JHP (per round) | JHP premium |
|---|---|---|---|
| 9mm | $0.17–0.24 | $0.50–1.20 | 3–5x |
| .45 ACP | $0.28–0.40 | $0.70–1.50 | 2.5–4x |
| .380 ACP | $0.22–0.30 | $0.55–1.00 | 2.5–3x |
| 5.56 NATO | $0.28–0.40 | $0.60–1.50 | 2–4x |
| .308 Winchester | $0.55–0.85 | $1.00–2.50 | 2–3x |
These are typical market ranges. Check current prices on the Ammo Price Index →
The cost difference is why nobody practices with hollow points. Buy FMJ in bulk for training, and keep 2–3 boxes of quality JHP for your carry gun and home defense firearm.
When to use FMJ
Range and training: This is 90% of your shooting. FMJ is cheap, feeds reliably, and shoots accurately. Buy the cheapest brass-cased FMJ you can find in your caliber. Search range ammo →
Competition: Many shooting sports allow or require non-expanding bullets. Some divisions in USPSA and IDPA allow JHP, but FMJ is universally accepted and far cheaper for match volume.
Stockpiling: If you're building a deep ammunition supply, FMJ stores well and gives you the most rounds per dollar.
When to use hollow points
Concealed carry: Every reputable firearms instructor recommends quality JHP for carry. Federal HST, Speer Gold Dot, Hornady Critical Duty, and Winchester Ranger are the most widely trusted lines.
Home defense (handgun): Same reasoning as carry. Over-penetration through interior walls is a real concern with FMJ. Quality JHP reduces this risk while maintaining terminal effectiveness.
Home defense (rifle): For 5.56 NATO home defense, the picture is more nuanced. Lightweight 5.56 FMJ (55gr M193) actually fragments and tumbles at close range, which can make it less likely to over-penetrate drywall than 9mm FMJ. Purpose-built 5.56 defensive loads like Hornady TAP or Federal Fusion offer the best combination of terminal performance and reduced over-penetration.
Hunting: Soft points and bonded hollow points are standard for hunting. They expand to create ethical kills while penetrating deep enough to reach vital organs. .308 Winchester, .30-06 Springfield, and 6.5 Creedmoor hunting loads are almost exclusively expanding designs.
What about other bullet types?
FMJ and JHP are the big two, but you'll also see:
Soft point (SP/JSP): A partially jacketed bullet with an exposed lead tip. Expands more than FMJ, less than JHP. Common in hunting rifle ammo and older defensive loads.
Open tip match (OTM): Looks like a hollow point but the tiny opening is a manufacturing artifact, not designed for expansion. Match-grade rifle ammo (like the 77gr Sierra MatchKing in 5.56) uses OTM for accuracy, not terminal performance.
Frangible: Compressed copper powder that disintegrates on hard surfaces. Used in steel-target training and close-quarters environments where ricochet is a concern.
Wadcutter: Flat-faced, full-diameter bullets used in .38 Special target shooting. They cut clean holes in paper for easier scoring.
The bottom line
Buy FMJ for training. Buy quality JHP for defense and carry. Don't carry FMJ for self-defense — the over-penetration risk isn't worth the few dollars you save. And don't train exclusively with JHP — you'll spend 3–5x more for identical trigger time.
The smart approach: practice with FMJ that matches your defensive load's grain weight and felt recoil as closely as possible. If you carry 124gr Federal HST, train with 124gr FMJ. Your mechanics transfer; your wallet survives.
Related articles
Sources
- Hague Convention of 1899 — Wikipedia — International law on expanding bullets
- SAAMI Glossary of Firearms Terms — Industry-standard definitions
- FBI Handgun Wounding Factors — Terminal performance standards