.22 WMR (.22 Magnum) Barrel Length vs Velocity

By Cole Harlan, Editor·Data checked Nov 4, 2026·How we verify·Editorial standards·Corrections

.22 WMR (.22 Magnum) velocity by barrel length

Velocity at every published length

Muzzle velocity in feet per second. Longest barrel first. A dash means not tested/published at this length.

Velocity lost per inch

This is how many fps each load loses for every inch cut off, between two lengths. Figures marked “calculated by GunReleases” are (fast velocity − slow velocity) ÷ (long length − short length) from the published points, to 1 decimal. “Tester’s stated avg” figures are the tester’s own.

Best barrel length for .22 WMR (.22 Magnum): the trade-offs

We don’t pick one length. Here is what the test measured in each common range, and what each choice costs.

• Pistol and revolver length (2 to 6 in). At 2 in the loads measured 843 to 962 fps. At 4 in the loads measured 1239 to 1510 fps. At 6 in the loads measured 1454 to 1821 fps.
• Rifle length (16 to 19 in). At 16 in the loads measured 1702 to 2316 fps. At 18 in the loads measured 1764 to 2324 fps. At 19 in the loads measured 1773 to 2355 fps.

Going from 16 in to 18 in, 1 of 5 loads measured no faster at 18 in. Example: CCI Maxi-Mag 40 gr JHP measured 1985 fps at 18 in and 1987 fps at 16 in. These are single test series, and three shots per length leaves room for noise.

• Handling: a longer barrel adds length and weight out front; a shorter one is easier to carry and swing.
• Suppressors: a suppressor adds length and weight at the muzzle, so a shorter barrel with a suppressor can end up about as long overall as a longer bare barrel. We have no velocity data with a suppressor mounted, so none is shown.

Box velocity vs measured

SAAMI’s Z299.1 (rimfire) sets the test barrel for .22 WMR (.22 Magnum) at 24 in for rifle ballistics, measured muzzle to breech face. The longest barrel tested here was 19 in, so this test does not reach the SAAMI length.

Federal minimum barrel length

Under 27 CFR 478.11, “Short-barreled rifle. A rifle having one or more barrels less than 16 inches in length…” A short-barreled shotgun is one with barrels “less than 18 inches in length.” Those are NFA firearms. Read the rule at eCFR 27 CFR 478.11, and see our SBR rules for 2026, the state NFA checker and the suppressor buying guide. Tester barrels shorter than 16 in on this page show what velocity does, not what you may build. This is not legal advice; state law can add limits.

How this was measured

• Test setup. Thompson/Center Encore pistol frame with custom barrels cut down 1 in at a time from 19 in to 2 in; 3 shots of each load at each length; two chronographs; barrel length measured from muzzle to breech face (no revolver cylinder gap).
• Where the BBTI page lives. BBTI’s live site returned an error when we checked on Nov 4, 2026, so we link its Internet Archive copy. The original address is http://www.ballisticsbytheinch.com/22mag.html (plain text, not linked). BBTI is an archived project that has not been updated since 2020.
• Our part. We copied each published number exactly. We did not average, smooth, estimate or fill in any length. A dash means the tester did not publish that length. The underlying measurements belong to the testers credited above; our compilation is CC BY 4.0.
• Limits. This is one test series with one rifle or pistol frame, one chronograph and one day’s weather. Your results will differ.
• Longer barrels. BBTI’s .22 WMR barrels started at 19 in rather than 18 in.

Download the data

barrel-length-velocity-22-wmr.csv has every number on this page with its source and test conditions. The combined file for all calibers and the barrel length vs velocity hub have the rest. Free to reuse under CC BY 4.0.

Frequently asked questions

Related

• Barrel length vs velocity: all calibers
• 9mm Luger barrel length vs velocity
• .380 ACP barrel length vs velocity
• .40 S&W barrel length vs velocity
• .357 SIG barrel length vs velocity
• .45 ACP barrel length vs velocity
• 10mm Auto barrel length vs velocity
• .38 Special barrel length vs velocity
• .357 Magnum barrel length vs velocity
• .44 Magnum barrel length vs velocity
• .45 Colt barrel length vs velocity
• .22 LR barrel length vs velocity
• 5.56 NATO / .223 Rem (AR-15) barrel length vs velocity
• .224 Valkyrie barrel length vs velocity
• 7.62x39 barrel length vs velocity
• .300 Blackout barrel length vs velocity
• .308 Win / 7.62 NATO barrel length vs velocity
• 6.5 Creedmoor barrel length vs velocity
• .243 Winchester barrel length vs velocity
• 7mm Remington Magnum barrel length vs velocity
• .300 Winchester Magnum barrel length vs velocity
• .22 WMR ammo 2026
• New ammo for 2026
• All GunReleases data

Sources

1. Ballistics By The Inch (BBTI), .22 WMR (.22 Magnum) test (Internet Archive copy)
2. Ballistics By The Inch: how the tests were done (Internet Archive copy)
3. SAAMI Z299.1 (rimfire)
4. eCFR: 27 CFR 478.11, definitions (short-barreled rifle)

Supplementary sources

News reports, advocacy groups, dealer practice and unofficial copies. They add context or report statements; the primary sources above control.

1. Cornell LII: 26 U.S.C. 5845, NFA definitions