The 9×23 Winchester is a centerfire handgun cartridge standardised by SAAMI in ANSI/SAAMI Z299.3. SAAMI sets its maximum average pressure at 55,000 psi, and measures its reference velocities in a 5.000 in standard test barrel rifled 1 turn in 16.00 in. This guide sets out SAAMI’s published reference velocity for each bullet weight, computes the muzzle energy each one carries, and compares the 9×23 Winchester with the 357 Magnum on the same basis.
9x23mm Winchester ballistics chart: SAAMI reference data
SAAMI publishes one nominal mean instrumental velocity for each reference bullet weight, measured at 15 feet from the standard test barrel. It does not publish energy, so the ft-lb column is computed. Where SAAMI lists more than one velocity for a weight, both ends of the span are shown.
Scroll the table sideways for the remaining columns.
| Bullet weight | Reference velocity | Computed muzzle energy |
|---|---|---|
| 124 gr | 1,460 fps | 587 ft-lb |
| 125 gr | 1,435 fps | 571 ft-lb |
What the numbers mean for a shot
SAAMI lists two reference bullet weights for the 9×23 Winchester, 124 and 125 grains. The lighter, 124 grains, is listed at 1,460 fps, which computes to 587 ft-lb. The heavier, 125 grains, is listed at 1,435 fps, which computes to 571 ft-lb.
None of this is a downrange figure. SAAMI measures at 15 feet, so retained velocity, energy and drop depend on the bullet’s ballistic coefficient, which SAAMI does not publish. Each product in our 9x23mm Winchester ammo range lists whatever its maker publishes for that item.
Barrel, chamber and pressure
SAAMI’s standard test barrel for the 9×23 Winchester is 5.000 in long and rifled 1 turn in 16.00 in, with a .3550 in groove diameter. That is the barrel every reference velocity above was measured in, not a statement about your handgun: handgun barrels vary widely in length, and a shorter barrel gives lower velocity. The maximum average pressure is 55,000 psi. Fire 9×23 Winchester ammunition only in a firearm chambered for it. Several unrelated cartridges share a number, so match the full designation on the box to the marking on your barrel.
9x23mm Winchester vs 357 Magnum: the SAAMI comparison
A figure from one maker’s catalogue cannot be laid beside a figure from another’s: each picks its own test barrel, zero and bullet, and many publish no test barrel at all. SAAMI is the shared basis, because it fixes one standard test barrel and one way of measuring velocity for every cartridge it lists.
Scroll the table sideways for the remaining columns.
| SAAMI specification | 9×23 Winchester | 357 Magnum |
|---|---|---|
| Maximum average pressure | 55,000 psi | 35,000 psi |
| Standard test barrel length | 5.000 in | Revolver test barrel (see SAAMI drawing) |
| Test barrel twist rate | 1 turn in 16.00 in | 1 turn in 18.75 in |
| Test barrel groove diameter | .3550 in | .355 in |
| Lightest reference load | 124 gr — 1,460 fps / 587 ft-lb | 101 gr — 1,650 fps / 610 ft-lb |
| A weight both list | 125 gr — 1,435 fps / 571 ft-lb | 125 gr — 1,500–1,875 fps / 624–976 ft-lb |
| Heaviest reference load | 125 gr — 1,435 fps / 571 ft-lb | 180 gr — 1,350–1,400 fps / 728–783 ft-lb |
SAAMI standardises the 9×23 Winchester at 55,000 psi and the 357 Magnum at 35,000 psi, so the 9×23 Winchester runs 20,000 psi higher. At 125 grains, a weight both list, SAAMI’s 9×23 Winchester reference velocity is 1,435 fps (571 ft-lb computed), against up to 1,875 fps (976 ft-lb) for the 357 Magnum. On that row the 357 Magnum carries the more energy.
What SAAMI cannot settle is anything past the muzzle. It publishes no ballistic coefficients and no downrange data, so it cannot say which cartridge shoots flatter at distance; that depends on the bullet. We stock the other side of this comparison too: 357 Magnum ammo.
9x23mm Winchester ballistics questions
What is the maximum pressure of the 9×23 Winchester?
ANSI/SAAMI Z299.3 sets the maximum average pressure for the 9×23 Winchester at 55,000 psi.
What twist rate and barrel length does SAAMI use for the 9×23 Winchester?
SAAMI’s standard test barrel for the 9×23 Winchester is 5.000 in long and rifled 1 turn in 16.00 in. Your own handgun may differ.
What bullet weights does SAAMI list for the 9×23 Winchester?
SAAMI lists 2 reference weights, from 124 to 125 grains: 124 and 125.
Is the 9×23 Winchester more powerful than the 357 Magnum?
Power is not a SAAMI measure, but reference muzzle energy is a fair proxy. At 125 grains, a weight both list, SAAMI’s 9×23 Winchester reference velocity is 1,435 fps (571 ft-lb computed), against up to 1,875 fps (976 ft-lb) for the 357 Magnum.
What is the effective range of the 9×23 Winchester?
Effective range is not a SAAMI specification and it is not a measured figure. SAAMI measures velocity at 15 feet, so it says nothing about performance at distance; that depends on the bullet and the shooter.
How much does the 9×23 Winchester drop at 100 yards?
SAAMI publishes muzzle velocity only, so it cannot give a drop figure. Drop depends on the bullet’s ballistic coefficient and on the zero range. A drop figure is unusable without its zero, so use the figure a maker prints for the specific load.
Where to buy these loads
Hilltop Armory carries 9x23mm Winchester ammunition from Winchester and CorBon. Browse the full 9x23mm Winchester ammo range.
