.17 WSM Ammo

.17 WSM vs. .17 HMR: Which Rimfire Is Faster?

The .17 WSM runs approximately 3,000 fps with a 20-grain bullet vs. approximately 2,550 fps for the .17 HMR with a 17-grain bullet — a 450 fps advantage. That velocity gap translates to a meaningfully flatter trajectory and better wind resistance at distance. A 20-grain .17 WSM load zeroed at 100 yards drops roughly 1.4” at 150 yards vs. approximately 2.5” for the .17 HMR. In a 10 mph crosswind at 200 yards, the .17 WSM drifts about 2.5” vs. approximately 4” for .17 HMR. For varminting past 150 yards in open, windy terrain, the .17 WSM’s ballistic advantage is meaningful and consistent.

.17 WSM Ballistics: What to Expect in the Field

The .17 WSM produces approximately 400 ft-lbs of muzzle energy with a 20-grain bullet — roughly double the .17 HMR’s 245 ft-lbs. At 200 yards it still carries over 200 ft-lbs, which is adequate for confident varmint kills on prairie dogs and ground squirrels. The high velocity and small frontal area produce explosive expansion on small targets. Effective varminting range is 200–250 yards for skilled shooters in moderate conditions; wind becomes the limiting factor at distance even with the .17 WSM’s superior ballistics. The cartridge is loud — a suppressor is a worthwhile addition. Since January 1, 2026, the NFA $200 tax stamp has been eliminated.

What Rifles Are Chambered in .17 WSM?

Rifle selection for .17 WSM is more limited than for .17 HMR due to the cartridge’s higher pressure requiring a stronger action. Savage offers it in the B-series bolt-action; Winchester in the Wildcat semi-auto; Franklin Armory and Volquartsen in semi-automatic platforms. The Savage B-series is the most widely available and affordable option. Semi-automatic .17 WSM rifles are more finicky about ammunition than bolt-actions — some loads cycle more reliably than others depending on the platform. For bolt-action reliability and accuracy, the Savage B-series is the practical first choice.

.17 WSM Ammunition Availability and Cost

The .17 WSM has narrower ammunition availability than .17 HMR — Winchester, Federal (through their American Eagle and other lines), and Hornady produce it, but it won’t be found at every sporting goods store. Online purchase is the most reliable sourcing strategy. Cost per round runs roughly 20–30% higher than .17 HMR for equivalent quality loads. For dedicated varmint hunters who shoot significant volumes at 150–250 yards, the ballistic improvement justifies the added cost and availability challenge. For general plinking and shorter-range varminting, the .17 HMR offers better value and easier sourcing.

.17 WSM for Predator and Varmint Hunting

The .17 WSM is an excellent predator cartridge for coyotes inside 150 yards — the high velocity and explosive expanding bullets produce immediate incapacitation, though pelt damage from the small, fast bullet is significant at close range. For prairie dogs, ground squirrels, and similar small varmints, the .17 WSM is devastatingly effective to 200+ yards. The combination of flat trajectory and superior wind resistance makes it a better field cartridge than the .17 HMR for any application where shots beyond 150 yards are routine. Running suppressed with subsonic loads is possible but limits range significantly — the .17 WSM performs best at supersonic velocities.

Frequently Asked Questions: .17 WSM

What is .17 WSM?
The .17 Winchester Super Magnum is a rimfire cartridge introduced in 2012 — the most powerful production rimfire cartridge available, firing a 20–25 grain .17-caliber bullet at 3,000 fps. That velocity produces a dramatically flat trajectory compared to .22 WMR and .17 HMR, extending practical accuracy for varmint hunting to 200+ yards from a rimfire rifle. The .17 WSM is based on a Winchester nail gun cartridge case, giving it more powder capacity than any previous rimfire design.

How does .17 WSM compare to .17 HMR?
The .17 WSM produces approximately 400 fps more velocity than .17 HMR — about 3,000 fps vs. 2,550 fps for comparable bullet weights. This translates to a flatter trajectory, less wind drift, and more retained energy at distance. The tradeoff is that .17 WSM requires a stronger action than .17 HMR and fewer rifle platforms are available. For serious varmint hunters who want maximum rimfire range, .17 WSM has a meaningful edge; for general small game and plinking, .17 HMR’s broader rifle selection is a practical advantage.

What rifles are available in .17 WSM?
Winchester produces the Model 1885 Low Wall and Savage the B.Mag in .17 WSM — the platform selection is more limited than .17 HMR or .22 WMR. Ruger and Volquartsen have offered .17 WSM configurations in limited runs. Verify current availability when selecting a rifle, as .17 WSM platform options are narrower than mainstream rimfire calibers.

See Also: .22 WMR Ammo • .22 LR Ammo • Rimfire Ammo • Bolt-Action Rifles • Ruger American Rimfire