FMJ vs Hollow Point: Construction and Comparison Evidence (2026)

What is the difference between FMJ and hollow-point ammunition?

FMJ means full metal jacket. SAAMI describes a jacket surrounding most of the projectile core while leaving the base uncovered. The label does not identify the exact core or jacket material of every product.

A hollow-point label describes a nose cavity. JHP means jacketed hollow point. Verify the manufacturer's construction description and stated design purpose for the exact load. A cavity alone does not establish measured expansion.

Neither label establishes firearm compatibility, feeding reliability, penetration depth, or a safe backstop.

Does a hollow point always expand?

A design description is not a test result. Record the exact manufacturer identifier, bullet weight, firearm or test barrel, distance, medium, and barriers.

Expansion and penetration results from one identified test do not establish behavior in every firearm or material. A gelatin result is not proof of what happens through a particular wall or in a real incident.

This page supplies no matched test series establishing that every JHP penetrates less than every FMJ. It does not certify a bullet type as safe for a defensive setting.

What does an FBI-protocol claim establish?

Inspect the actual report, not just a product-family name or an agency reference. Record the protocol version, calibration, conditions, individual results, and the report's stated acceptance criteria.

Do not attribute one tested load's results to every load in Federal HST, Speer Gold Dot, Hornady Critical Duty, or another family. A passing test does not guarantee an outcome.

Does FMJ cost less than hollow-point ammunition?

Compare dated offers for identified products. This page provides no dataset establishing a universal price ratio or a manufacturing-volume explanation.

Listed cost per round equals package price divided by round count. Delivered cost additionally requires applicable shipping, tax, and discounts. Unknown shipping does not establish a delivered-cost winner.

These category pages provide search context, not proof that all products share one construction or price:

The Ammo Price Index describes scoped observations, not a currently purchasable offer. Historical prices do not guarantee current stock or future prices.

Are FMJ and JHP allowed at ranges or competitions?

Check the current rules for the specific range or event. A construction label does not establish permission. Restrictions can concern more than the nose shape.

Follow the firearm manufacturer's instructions for the exact ammunition and configuration. This page does not provide firing or function-testing instructions.

Storage requirements also come from the manufacturer and applicable safety guidance, not a price or construction ranking. See ammo storage and shelf life.

Does matching bullet weight make practice ammunition equivalent?

No. Equal bullet weights do not establish equal recoil, point of impact, feeding, or terminal performance.

Even equal published muzzle velocity and energy would not establish equivalence across those properties. Record exact identifiers and comparable test conditions for the property you are examining.

Search criteria must be stated rather than inferred from a cartridge or intended use. Search 9mm FMJ by listed cost per round without treating that ordering as a defensive recommendation.

How should other construction labels be compared?

Soft point, open tip match, frangible, bonded, and polymer-tipped labels describe different design features. Verify the exact manufacturer's definition before assigning behavior to a product.

An open tip is not proof of designed expansion. A frangible label is not a guarantee against ricochet or permission to disregard target and backstop requirements.

See bullet types explained for terminology. Product-specific testing remains necessary for performance claims.

Sources

SAAMI: Full metal jacket bullet — Construction definition, not a performance or price certification.

FMJ vs hollow point