10mm Auto vs 9mm Luger: Data Driven Comparison

10mm Auto and 9mm Luger are both centerfire pistol cartridges, but they are not close duplicates. The data shown here include larger listed bore and groove dimensions for 10mm Auto than for 9mm Luger. Published examples also show some 10mm Auto loads with heavier bullets and higher listed muzzle energy than the 9mm Luger example shown here, although real velocity and recoil vary by firearm, barrel length and load.

This comparison stays with published dimensions, velocity standards, and ammunition maker ballistics. For broader background, see the 10mm Auto guide. For adjacent cartridge comparisons, see 9mm vs .45 and 10mm vs .45.

Names and scope

SAAMI Z299.3-2022 covers pressure, velocity and dimensional characteristics for centerfire pistol and revolver sporting ammunition and their chambers.

SAAMI also lists 9mm Luger +P as a separate active cartridge entry. SAAMI states that +P ammunition is loaded to a higher pressure and is marked with +P on the case headstamp. This article mentions SAAMI 9mm Luger +P for context, but the main comparison is standard 9mm Luger against 10mm Auto.

Case and bore dimensions

SAAMI drawings show one basic size difference between the two cartridges. 10mm Auto has larger listed bore and groove dimensions than 9mm Luger.

SAAMI dimension	9mm Luger	10mm Auto
Bore diameter	.346 inch	.3900 inch
Groove diameter	.355 inch	.4005 inch

The practical takeaway is simple: 10mm Auto has larger listed bore and groove dimensions than 9mm Luger.

SAAMI pressure and standard velocity data

SAAMI’s velocity and pressure tables also list nominal test barrel velocities by bullet weight and load line. For 9mm Luger, SAAMI lists bullet weights from 88 grains through 150 grains, with nominal test barrel velocities shown from 900 fps to 1,500 fps depending on the bullet weight and load line. For 10mm Auto, SAAMI lists bullet weights from 135 grains through 200 grains, with nominal test barrel velocities shown from 985 fps to 1,410 fps depending on the bullet weight and load line.

SAAMI warns that velocities measured in standard test equipment should not be expected to match velocities from ordinary firearms. SAAMI points to firearm tolerances and barrel length differences as reasons velocities can differ.

Published factory load examples

The tables below use Federal and Hornady published ballistics. They are examples, not complete lists of all loads. Barrel length matters, and the listed barrel lengths are the test barrel lengths published with the load data where provided.

Defensive and service style examples

Maker	Cartridge	Load	Bullet weight	Velocity	Muzzle energy	Test barrel
Hornady	9mm Luger	XTP 90242	124 gr	1,110 fps	339 ft-lb	4 in
Hornady	10mm Auto	XTP 9126	180 gr	1,275 fps	650 ft-lb	5 in

In these published examples, the 10mm Auto load uses a heavier bullet than the 9mm Luger load and lists higher muzzle energy. The comparison is not perfectly controlled because the 9mm example uses a 4 inch test barrel and the 10mm example uses a 5 inch test barrel.

Practice and general ball examples

Hunting oriented 10mm examples

Federal describes its Fusion 10mm Auto as a hunting load and states that it uses a 200 grain bullet at 1,200 fps muzzle velocity. Hornady’s published chart also lists a 10mm Auto Handgun Hunter load.

Maker	Cartridge	Load	Bullet weight	Velocity	Muzzle energy	Test barrel
Federal	10mm Auto	Fusion SP F10FS1	200 gr	1,200 fps	639 ft-lb	5 in
Hornady	10mm Auto	Handgun Hunter MonoFlex 91267	135 gr	1,315 fps	518 ft-lb	5 in

These are 10mm Auto examples only. The fact that a manufacturer labels a load for hunting does not answer whether a cartridge, handgun or bullet is allowed for a specific species or place.

Recoil comparison

A precise recoil comparison needs more than cartridge name. SAAMI’s recoil formula sheet frames free recoil as a conservation of momentum calculation. It says recoil calculations require firearm weight, ejecta weight, propellant gas or powder charge weight and velocity.

SAAMI also notes that this free recoil approach does not account for devices such as muzzle brakes or suppressors. SAAMI states that felt recoil can vary, and action type and other firearm features can affect what the shooter feels.

That means a simple statement like “10mm recoils this much more than 9mm” is incomplete without naming the firearm and load assumptions. Based on the published examples in this article, some 10mm Auto loads use heavier bullets and list higher muzzle energy than the listed 9mm Luger example, but felt recoil still depends on the specific handgun and ammunition.

Magazine capacity examples

Magazine capacity is a firearm design feature, not a fixed property of the cartridge alone. Still, same maker examples can show a common pattern when comparing full size pistols.

Glock’s official G17 Gen5 MOS page lists the pistol in 9x19 mm with a standard magazine capacity of 17 rounds. Glock’s 2026 buyer guide lists the G20 V MOS in 10mm Auto with a 15/10 magazine entry, indicating a 15 round standard capacity and a 10 round option in that guide.

Example pistol	Chambering listed by Glock	Listed magazine capacity
Glock G17 Gen5 MOS	9x19 mm	Standard: 17
Glock G20 V MOS	10mm Auto	15/10 entry in Glock’s 2026 buyer guide

These examples should not be treated as universal cartridge capacities. Different pistol models, magazine designs and jurisdiction specific configurations can differ.

Typical uses shown by published loads

For 9mm Luger, the example in this comparison includes a Hornady XTP load.

For 10mm Auto, the examples cover defensive style loads and hunting oriented loads. Federal describes Fusion 10mm Auto as a hunting load, and Hornady lists 10mm Auto XTP and Handgun Hunter options.

This article does not make a which to buy recommendation. The data show that 10mm Auto has larger listed bore and groove dimensions and, in one listed factory example, carries a heavier bullet and higher muzzle energy than the listed 9mm Luger example. The Glock example shows a 17 round standard magazine in a full size 9x19 mm pistol compared with a 15 round standard entry for the 10mm Auto example.

What to check before deciding

Check the current ammunition maker catalog for the exact load, including barrel length, velocity and energy. Check the firearm manufacturer’s manual for approved ammunition, including any +P guidance for 9mm Luger. For hunting, check the current rules from the state, provincial or territorial wildlife agency for the species, method, season and location.