Bullet Types: A Reference Guide

Assortment of different bullet types

Acronyms are everywhere in the gun and ammunition industry, and when reading through descriptions, it is enormously helpful to know just what those acronyms stand for. We frequently get questions from customers regarding various bullet types in both handgun and rifle cartridges. It’s easy to see why: there are numerous terms and acronyms used to describe the bullets.

Let’s briefly go over the basic types of bullets that can be found on the market today.

A group of 9mm bullets for a a gun isolated on white
Full Metal Jacket Handgun Ammo

Common Bullet Types

  • FMJ (Full Metal Jacket): Metal cased and full metal jacket both refer to bullets with a metal coating that covers all of, or all but the base of, a bullet.

  • MC (Metal Cased): This is a term used by Remington to refer to their full metal jacketed bullets.

  • HP (Hollow Point): Hollow point bullets have a concave shaped tip that facilitates rapid expansion of the round upon impact.

  • BT (Boat Tail): Boat tail bullets have a streamlined base to facilitate better aerodynamics.

Sometimes, these terms are mixed to make a new acronym.

  • FMJBT (Full Metal Jacketed Boat Tail): Full metal jacket boat tail ammunition commonly refers to rife ammunition with the boat tail design that incorporates a copper jacket.

  • JHP (Jacketed Hollow Point): Jacketed hollow point bullets are similar in design to regular hollow point bullets, but have a copper jacket that normally covers everything but the hollowed portion of the round.
2 40 caliber bullets on a black reflective background
Jacketed Hollow Point Handgun Ammo
  • JFP (Jacketed Flat Point): Jacketed flat point rounds have a flat area of exposed lead at the tip.

  • JSP (Jacketed Soft Point): Jacketed soft point bullets usually have a spire pointed tip of exposed lead. JSP can also refer to a Jacketed spitzer point; spitzer meaning a sharply pointed bullet.

  • JRN (Jacketed Round Nose): Jacketed round nose bullets split the difference between JFP and JSP bullets and have a rounded tip of exposed lead.

  • BTHP (Boat Tail Hollow Point): BTHP ammunition commonly refers to rife ammunition with the boat tail design that utilizes an expanding hollow point design.

  • BTSP (Boat Tail Soft Point): Sometimes the letters in the acronyms are switched, so boat tail soft point may also be abbreviated as soft point boat tail or SPBT.

  • EFMJ (Expanding Full Metal Jacket): Expanding full metal jacketed rounds appear as and feed like a regular full metal jacket bullet, but have a construction that allows the case to collapse and the bullet to flatten upon impact.

  • WC (Wad Cutter): Wad cutter designs often appear to be nothing more than a cylinder, usually with a hollow base. This design is used in target practice to punch neat holes in the paper, rather than the ragged holes produced by more rounded designs.
Bullets with a steel core loaded on rifle cartridges with a white background
Full Metal Jacket Boat Tail Rifle Ammo
  • SWC (Semi Wad Cutter): Semi wad cutter bullets have a rounded nose that comes down to a cylinder that is slightly larger than the rounded section, giving the bullet a more aerodynamic shape while allowing it to punch clean holes in paper targets.

  • RFP (Rounded Flat Point): Rounded flat point bullets have a flat tip that is smaller than the bullet diameter and rounded shoulders.

  • AP (Armor Piercing): Armor piercing ammunition can have bullets with a variety of shapes, though in general they are spire pointed and full metal jacketed rounds that have a strong core designed to penetrate armor.

  • API (Armor Piercing Incendiary): Armor piercing incendiary ammunition has the same penetrating abilities of armor piercing bullets, but with the added function of bursting into an intense flame upon impact.

  • Frangible: Frangible ammunition is available under a number of trademarks; notably MagSafe, Glaser, and SinterFire. All of these rounds are characterized by a design that facilitates the rapid breakup of the bullet upon impact, thus reducing the chances of over-penetration or a ricochet.

  • Shotshell: Shotshell ammunition is primarilly designed for pest control and utilizes a plastic capsule filled with small pellets that spread when fired.

This list is by no means exhaustive. There are other variations in bullet designs, many of which are proprietary and made only by certain manufacturers.

If there are other bullet types you think should be listed, be sure to let us know in the comment section.

Editor’s note: This post was originally published in March of 2010. It has been completely revamped and updated for accuracy and clarity.

The Mission of Cheaper Than Dirt!'s blog, The Shooter's Log, is to provide information—not opinions—to our customers and the shooting community. We want you, our readers, to be able to make informed decisions. The information provided here does not represent the views of Cheaper Than Dirt!

Comments (16)

  1. TSJ – Total Synthetic Jacket
    Made by Federal and marketed as Syntech, They come in Red for range rounds, Blue for fragmenting defense rounds, and Purple, as a sort of combination of both. Red come in several grain weights and profiles.
    Also worth mentioning reloading component bullets made by BlueBullets They’re blue, and they’re used extensively by competition shooters who load to power factor.

  2. Daniel!!

    Thanks a load, my man! That makes good sense, now that you have explained.
    Have a good one.

  3. Hello,
    I have come up against one that I am unsure of what it means. RSFP …Round S– Flat Point?? Round sides? Surplus? Squished? Hell, I don’t know! Can anyone out there help this Old Man clear up this confusion?
    If it helps any , the ammo is on website -> AmmoMart and is list thusly: .32 H&R Magnum Overstock Ammo 90gr RSFP – 50 Rounds
    The closest I can compare it to is,
    RFP: Rounded Flat Point (see list above in article)
    Thanks & Regards,

    1. The semi-jacketed hollow point (SJHP) is a bullet designed to give you all the stopping power and expansion of a normal hollow point but with a bit more penetration.The partial jacket acts as a platform for creating a predictable and uniform mushrooming effect upon impact with a target. ~Dave Dolbee

  4. I was looking for reloading data for 8208 using 69 gr bullets and the Hodgen website lists SIE HPBT – I know what the HPBT is abbreviated for (Hollow Point Boat Tail) but have not been able to find SIE anywhere (yet)

  5. Hi. What’s the similarities/differences between a JHP and HP? Which is better for self defense? I am under the impression that only difference with a JHP and HP, is the JHP leaves less lead foul up – that’s the only difference. Is that correct? Also, does one penetrate more than the other? Thank you very much.

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