.17 HMR vs .17 WSM: Is the Bigger .17 Worth the Switch?

Every few years somebody at the gun counter asks the same thing: "If the .17 HMR is good, isn't the .17 WSM just better?" On paper, yes. In a hayfield on a gusty afternoon, the answer depends more on what you can buy, what rifle you can find, and how far your shots really are than on the velocity printed on the box.

This is an editorial comparison built from published specifications and catalog listings. Nothing here comes from our own range sessions, and every number below traces to a source listed at the end.

Two cartridges, two very different family trees

The .17 HMR (Hornady Magnum Rimfire) arrived in 2002. Hornady built it by necking the .22 WMR case down to .17 caliber, working with Marlin and Ruger so rifles were ready at launch. Because the parent case was already common and many .22 WMR actions could take a new barrel, the HMR spread fast. Today CCI, Federal, Hornady, Remington, Winchester and others load it.

The .17 WSM (Winchester Super Magnum) is a different animal. It was introduced at the 2013 SHOT Show alongside Savage, and its case did not come from any existing rifle cartridge. It started life as a .27-caliber nail-gun blank, the kind construction crews use to drive fasteners, necked down to take a .17 bullet. That industrial origin is why the case is so much stouter than an HMR's.

The numbers side by side

Here is the core comparison, taken from published cartridge specifications. Velocities are nominal muzzle figures; your barrel will differ.

Put plainly: with the same 20-grain bullet, the WSM starts about 650 fps faster and carries roughly 60 percent more energy at the muzzle. Even its heavier 25-grain load leaves the barrel faster than a 20-grain HMR.

What the extra speed buys you in the field

Speed does two useful things for a varmint shooter. It flattens the trajectory, so a holdover mistake at an unknown distance costs you less. And it shortens the bullet's time of flight, which gives the wind less time to push a light .17 bullet around. That second point matters more than people think. A 17- or 20-grain bullet has very little mass, and on breezy days a rimfire .17 can drift a surprising amount at longer ranges. If you have not already read our piece on reading wind at rimfire distances, the short version is that the wind call usually decides the shot long before velocity does.

So the WSM stretches your practical range on ground squirrels, prairie dogs and similar small varmints. What it does not do is turn a .17 into a coyote or deer cartridge. These are light, fast, frangible bullets built to break apart on small animals. Check your state's rules on what each cartridge can legally be used for, and keep shots inside the distance you can actually hit a small target on demand.

Where the HMR is still enough

For most backyard pest control, farm rodent work and squirrel-sized varmints inside typical HMR distances, the HMR is not the weak link. Shooter skill, a steady rest and a good scope matter more. Our .17 HMR vs .22 WMR comparison covers where the HMR sits against the other magnum rimfire.

Rifles: the HMR's biggest advantage

This is the part that settles the question for a lot of buyers. The .17 HMR has been chambered in almost every kind of rimfire rifle for two decades: bolt guns from Ruger, CZ and Savage, lever guns, single shots and a few semi-autos. The used market is deep, and so is the aftermarket for magazines, stocks and mounts.

The .17 WSM list is short. Published references name the Savage B-Mag bolt action, the Ruger 77/17, the Winchester 1885 Low Wall single shot, the Franklin Armory F-17 (described as a gas-piston semi-auto designed to handle the pressure) and a Jard AR-style rifle. That is enough to find a good rifle, but it is not a deep bench, and some of those models come and go from catalogs.

If you already own a bolt-action HMR you like, the rifle question alone may keep you there. If you are buying from scratch and want the WSM, plan around the rifle first and buy a quantity of the load it groups best with.

Ammo: choice and availability

The other practical gap is the ammunition shelf. Factory .17 WSM has come from Winchester, Federal and American Eagle, and the published lineup has been short: Winchester's 20-grain Varmint HV, 25-grain Varmint HE and a 15-grain lead-free Varmint-X, plus a 20-grain polymer-tip from American Eagle.

The difference shows up at retail too. When we checked Ammunition Depot's catalog for this article, the .17 HMR page listed well over a dozen loads from CCI, Federal, Hornady, Remington and Browning, while the .17 WSM page listed two, both from Winchester. Stock changes, but the gap is the point. Our best .17 HMR ammo guide sorts the HMR loads by job.

Per-round cost tends to favor the HMR as well, simply because there are more makers competing for that shelf. Prices move constantly, so compare the current listings: browse the full .17 HMR ammo category and the .17 WSM category side by side before you commit to a rifle.

Who should switch, and who should stay

One more consideration: louder and harder-hitting also means more backstop responsibility. A fast .17 bullet usually fragments, but fragments and misses still travel. Know what is behind your target every time, and do not shoot at anything on a hard surface or skyline.

Whichever you pick, a rimfire scope with adjustable parallax and a solid rest matter more than the last few hundred feet per second. Our .17 HMR and .17 WSM gear guide covers optics, bipods and rangefinders for both. If you are shopping rifles at the same time, start with the bolt-action rifle category and filter by chambering.

The bottom line

The .17 WSM is the faster, flatter, harder-hitting .17, and the numbers are not close. But the .17 HMR is the cartridge with the rifles, the loads and the shelf space. For most shooters the HMR is still the smarter buy. The WSM earns its place when you have open country, longer shots and the discipline to build a rifle around one load.

Editorial note: This is an independent editorial overview built from manufacturer information, retailer listings and published reporting. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and legality for your own situation.

Affiliate disclosure: Some links on this page are affiliate links to Ammunition Depot. We may earn a commission if you buy through them, at no extra cost to you. Our editorial choices aren't influenced by commissions. Check current price, stock and specifications directly with the retailer.