9mm 115 vs 124 vs 147 grain: what changes and what it costs

Walk down a 9mm aisle, or scroll the 9mm caliber page, and you'll see three bullet weights over and over: 115, 124 and 147 grain. They all fit the same pistols and magazines. What changes is how fast the bullet leaves the barrel, how the recoil feels, where it hits relative to your sights, whether it breaks the sound barrier and what it costs per round. This guide covers each of those using SAAMI and manufacturer data, then shows live, in-stock offers for each weight, cheapest per round first.

The short answer

• 115 grain is the lightest and fastest of the three, and the everyday range weight. It has traditionally been the least expensive 9mm to shoot. Browse 115 gr.
• 124 grain sits in the middle on weight and velocity. It's common in both practice ammo and defensive lines. Browse 124 gr.
• 147 grain is the heaviest and slowest. Standard-pressure 147-grain loads are usually subsonic, which is why they're a common choice for suppressed shooting. Range ammo in this weight is less common and has often cost a little more per round. Browse 147 gr.

Those cost patterns are long-running tendencies, not guarantees, and a sale can flip them. The live tables below show today's prices for each weight.

What grain means

Grain is a unit of weight. There are 7,000 grains in a pound, and one grain is about 64.8 milligrams. On an ammo box, the grain figure is the weight of the bullet only, not the whole cartridge and not the powder charge.

All three are 9mm Luger (also sold as 9x19mm and 9mm Parabellum), so they share the same case and chamber. Bullet weight is a choice within the cartridge, not a different cartridge.

115 vs 124 vs 147 at a glance

The cleanest way to compare weights is one manufacturer, one product line and one test barrel. Federal's American Eagle FMJ range line comes in all three weights, with velocities published from a 4-inch test barrel:

SAAMI's figures come from its voluntary industry standard for centerfire pistol ammunition and are measured in a 4-inch test barrel. SAAMI notes that velocities from ordinary firearms shouldn't be expected to match test-barrel numbers exactly, and barrel length is one big reason.

What changes as the bullet gets heavier

Velocity

At the same pressure limit, a heavier bullet leaves the barrel slower. You can see it in every source above: SAAMI's standard-pressure reference velocities run from 1,135–1,210 fps for 115 grain down to 985 fps for 147 grain, and Federal's American Eagle line steps down from 1,180 to 1,150 to 1,000 fps.

Recoil and how it feels

Recoil depends on the bullet's weight and speed, the powder charge and the gun. A lighter bullet going faster and a heavier bullet going slower can end up with similar momentum. Competition shooters measure this with "power factor": bullet weight in grains times velocity in fps, divided by 1,000. Using Federal's published American Eagle numbers, that works out to about 136 for 115 grain, 143 for 124 grain and 147 for 147 grain. That's a gap of about 8% between the lightest and heaviest loads, before powder weight and the pistol come into it.

Shooting Times' recoil calculations found that recoil force across 9mm bullet weights is "not that different." The feel can differ, though. Many shooters describe 115-grain loads as snappier and 147-grain loads as more of a push, and the usual explanation is that the lighter bullet has to accelerate harder to reach its higher speed. Felt recoil is personal and varies by pistol, so the honest advice is to shoot a box of each and see what you prefer.

Point of impact

Changing bullet weight can move where your shots land, even with the same sights and the same hold. In a handgun, the muzzle starts rising in recoil while the bullet is still in the barrel. A slower bullet spends more time in the barrel, so heavier, slower loads often hit higher than lighter, faster ones at the same distance. American Rifleman measured one example in a 9mm pistol: 147-grain bullets hit about 3 inches higher at 25 yards than 125-grain bullets.

The size of the shift varies by gun and load, so confirm it on paper. If your pistol has fixed sights, it's worth testing a couple of weights to see which one hits closest to your point of aim.

Speed of sound and subsonic 147 grain

A bullet that travels faster than sound makes a sharp crack downrange. Subsonic ammo stays below that speed. According to American Rifleman, the speed of sound at sea level is about 1,087 fps at 32°F and about 1,125 fps at 68°F. It rises with temperature and humidity and drops at altitude.

Standard-pressure 147-grain loads are usually rated comfortably below that line:

• Federal American Eagle 147 gr FMJ: 1,000 fps
• Speer Gold Dot 147 gr hollow point: 985 fps
• Hornady 147 gr XTP Subsonic: 975 fps

All three are rated from 4-inch test barrels. Typical 115-grain loads are rated above the speed of sound. 124-grain loads vary: Federal's American Eagle 124 gr is rated above it, but SAAMI's reference list also includes slower 124-grain entries, so check the specific load.

Barrel length matters here. A longer barrel than the test barrel, such as on a pistol-caliber carbine, can push a load faster, and individual shots in any lot vary. American Rifleman notes that makers generally load subsonic ammo to 1,000–1,050 fps for this reason, yet a few shots can still go supersonic in some guns. If staying subsonic matters to you, check your load over a chronograph in your gun.

Suppressor use

Subsonic 147-grain loads are a common pairing with suppressors, because removing the bullet's sonic crack makes suppressed shooting much quieter. Supersonic ammo can still be fired through a suppressor and is substantially quieter than unsuppressed, just not as quiet as subsonic. American Rifleman also notes that some semi-auto pistols don't cycle as reliably with lower-pressure subsonic ammo, sometimes needing a different recoil spring, so test before you rely on a load. Suppressors are regulated, so follow federal, state and local law.

+P is about pressure, not weight

You'll see "+P" on some 9mm boxes in all three weights. It isn't a bullet weight. It means the load is built to a higher pressure limit: SAAMI's maximum average pressure is 35,000 psi for standard 9mm Luger and 38,500 psi for 9mm Luger +P, and the case headstamp is marked +P. The extra pressure buys extra velocity. For example, SAAMI's reference velocity for 124-grain +P is 1,180 fps, and Speer rates its Gold Dot 124 gr +P at 1,220 fps.

SAAMI says +P ammunition should be used only in firearms designed for it and recommended by the manufacturer. Check your pistol's manual before buying any.

Typical uses by weight

115 grain

The common choice for range practice and plinking, often as FMJ in bulk packs. Defensive hollow points exist in this weight too, such as Speer Gold Dot 115 gr (rated at 1,210 fps). For choosing a practice load, see best 9mm range ammo.

124 grain

A middle ground that shows up in both range lines and defensive lines. Federal HST 124 gr and Speer Gold Dot 124 gr are each rated at 1,150 fps from a 4-inch test barrel, the same velocity Federal publishes for its American Eagle 124 gr FMJ. Some shooters practice with the same bullet weight they carry, so the sights and recoil feel match.

147 grain

The usual weight for subsonic and suppressed shooting, and also common in defensive and duty lines, such as Federal HST 147 gr (1,000 fps) and Speer Gold Dot 147 gr (985 fps). If you want 147-grain practice ammo, Federal's American Eagle 147 gr FMJ is rated at the same 1,000 fps as the HST 147.

124 vs 147 grain for self-defense

It comes up a lot, so here's the factual version. Both weights are mainstream defensive choices. Federal's HST and Speer's Gold Dot lines each offer 124- and 147-grain hollow points, and manufacturers publish test results for many defensive loads. Speer's catalog, for example, publishes FBI-protocol test results for its 124-grain +P Gold Dot and gelatin and barrier results for its 147-grain Gold Dot G2. Bullet weight alone doesn't make one load better than another.

What matters more:

1. It runs in your pistol. Fire enough of your chosen load through your own gun to trust that it feeds, fires and ejects reliably.
2. You shoot it well. Accuracy and fast follow-up shots matter more than a spec-sheet difference.
3. It's from an established manufacturer with published testing you can read.
4. It's legal where you are. Some states and localities regulate hollow-point ammunition. Check the law where you live and anywhere you travel.

For how hollow points differ from range FMJ, see FMJ vs hollow point.

What each weight costs to shoot

Bullet weight is only one part of the price. Bullet type usually matters more: defensive hollow points generally cost more per round than FMJ in any weight. Pack size matters too, since bulk cases often, though not always, cost less per round than 50-round boxes. Within range FMJ, 115 grain has traditionally been the cheapest, 124 grain is often close, and 147-grain range ammo is less common and has often cost a little more. Prices move, so check the live tables below: they show today's in-stock offers for each weight.

Each table includes every bullet type at that weight, so FMJ range ammo and defensive hollow points can appear in the same list. Use the filters on the caliber page to narrow by bullet type, case material or round count.

115 grain 9mm

Every listing at this weight, with more filters: 9mm, 115 grain.

124 grain 9mm

Every listing at this weight, with more filters: 9mm, 124 grain.

147 grain 9mm

Every listing at this weight, with more filters: 9mm, 147 grain.

To see how 9mm compares with other calibers on cost per round, see the cheapest calibers to shoot.

How to choose

1. Check your pistol's manual for ammunition guidance, especially on +P.
2. Check your range's rules. Some ranges restrict steel-case ammo or bullets that stick to a magnet.
3. Buy a box of each weight you're considering, from the same line if you can, so the only big difference is bullet weight.
4. Shoot them side by side. Note any malfunctions, how each one feels and where each one hits relative to your sights.
5. Pick the one that runs best and hits where you aim, then compare it on cost per round across box and case sizes. More in cost per round, explained.
6. Watch the price. Every offer shows when it was last checked, and product pages show D.O.P.E. price history, so you can tell a real drop from a normal price. See how D.O.P.E. price history works.

Here's what a small gap in cost per round adds up to. Example math only, not current prices: 500 rounds at $0.30 a round is $150, and at $0.35 a round it's $175. Plug in any listing:

Sources

• SAAMI, ANSI/SAAMI Z299.3, Voluntary Industry Performance Standards for Pressure and Velocity of Centerfire Pistol and Revolver Ammunition (9mm Luger and 9mm Luger +P reference velocities by bullet weight and maximum average pressures, 35,000 and 38,500 psi; 4-inch test barrel; +P use only in firearms designed and recommended for it; test-barrel velocities not expected to match ordinary firearms).
• NIST, Handbook 44, Appendix C: General Tables of Units of Measurement (1 pound = 7,000 grains; 1 grain = 64.79891 milligrams).
• Federal Premium, American Eagle 9mm Luger 115 gr FMJ (AE9DP), 124 gr FMJ (AE9AP) and 147 gr FMJ (AE9FP) (1,180, 1,150 and 1,000 fps from a 4-inch test barrel).
• Federal Premium, Personal Defense HST 9mm Luger 124 gr (1,150 fps, 4-inch test barrel) and HST 147 gr (P9HST2) product specification sheet (1,000 ± 20 fps, 4.00-inch SAAMI test barrel).
• Speer, Gold Dot Personal Protection 9mm Luger 124 gr (1,150 fps) and 147 gr (985 fps), 4-inch test barrel.
• Speer, 2024 catalog (Gold Dot 9mm 115 gr at 1,210 fps and 124 gr +P at 1,220 fps, 4-inch test barrel; FBI-protocol test results for 124 gr +P Gold Dot; gelatin and barrier results for 147 gr Gold Dot G2).
• Hornady, 9mm Luger 147 gr XTP Subsonic (975 fps from a 4-inch test barrel; designed for subsonic use, with or without a suppressor).
• American Rifleman (NRA), Subsonic ammo 101: everything the suppressor shooter should know (speed of sound by temperature, humidity and altitude; barrel length and velocity spread; subsonic loads generally made at 1,000–1,050 fps; supersonic ammo through a suppressor; cycling with subsonic loads).
• American Rifleman (NRA), Manipulating fixed handgun sights (slower bullets stay in the barrel longer and hit higher; 147 gr vs 125 gr in a 9mm pistol at 25 yards).
• American Handgunner, The ups and downs of handgun bullets (barrel time and muzzle rise: heavier or slower handgun bullets usually hit higher).
• Shooting Times, Handgun recoil 101 (what goes into recoil force; 9mm bullet weights produce similar recoil force but can feel different).
• NRA Shooting Sports USA, Review: Federal Syntech Action Pistol ammo (power factor as bullet weight times velocity; heavy bullets described as a softer push and light bullets as a snap).

9mm bullet weight FAQ

What does grain mean on a box of 9mm ammo?

Grain is the weight of the bullet. One grain is 1/7,000 of a pound, or about 64.8 milligrams, so a 115-grain bullet weighs about 7.5 grams, a 124-grain bullet about 8.0 grams and a 147-grain bullet about 9.5 grams. It isn't the weight of the whole cartridge or the powder charge.

Which 9mm grain is cheapest?

115-grain FMJ has traditionally been the least expensive 9mm to shoot, because it's the everyday range weight. 124-grain range ammo is usually close behind, and 147-grain range ammo is less common and has often cost a little more per round. Those are general patterns, not guarantees, and sales can change the order: the live tables in this guide show today's prices for each weight.

What grain 9mm is subsonic?

Subsonic depends on velocity, not weight alone, but standard-pressure 147-grain loads are usually the subsonic ones. Published examples include Federal American Eagle 147-grain FMJ (1,000 fps), Speer Gold Dot 147-grain (985 fps) and Hornady 147-grain XTP Subsonic (975 fps), all from 4-inch test barrels. The speed of sound is about 1,125 fps at 68°F at sea level and lower in cold air. Typical 115-grain loads and many 124-grain loads are rated faster than that. Barrel length changes velocity, so a chronograph is the only way to confirm what your gun does.

Is 124 or 147 grain better for self-defense?

Neither weight is automatically better. Major defensive lines, including Federal HST and Speer Gold Dot, offer both 124- and 147-grain loads. Pick a load from an established manufacturer, look at its published test data, and make sure it runs reliably in your pistol and that you shoot it accurately. Some states and localities regulate hollow-point ammunition, so check the law where you live and travel.

Does 147 grain 9mm have less recoil?

Not necessarily less, but it often feels different. With typical factory loads, the heavier, slower 147-grain bullet and the lighter, faster 115-grain bullet produce fairly similar recoil force. Many shooters describe 147-grain loads as more of a push and 115-grain loads as more of a snap. Felt recoil is personal and depends on the pistol, so try a box of each.

Is +P a bullet weight?

No. +P marks a load built to a higher pressure limit: SAAMI's maximum average pressure is 35,000 psi for standard 9mm Luger and 38,500 psi for 9mm Luger +P. +P loads come in several bullet weights. SAAMI says to use +P only in firearms designed for it and recommended by the manufacturer, so check your pistol's manual.

Does cost per round include shipping and tax?

No. On Price Dope, cost per round is the listed price divided by the number of rounds. Shipping, taxes, fees and coupons are set by the retailer and may not be included, so check the final price at checkout.

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