Author: Jason Marsh

By Craig Boddington

When selecting a hunting cartridge, three considerations are most important: Accuracy, shooting ranges, and power, all adequate for the game to be hunted. These apply for hunting any game from prairie dogs to pachyderms.

For varmints, power might seem a silly consideration, so let’s consider that first. The word “varmint” is uniquely American, a corruption from the English “vermin.” The implication is noxious pests, generally removed with minimal restrictions (such as seasons, bag limits, and license requirements). The game Americans generally consider “varmints” range from grass-eating and hole-digging rodents up to coyotes. The distinction can change. In British East Africa (now Kenya and Tanzania), lions were classed as vermin until late in the game. In Europe, the marmot (relative to our woodchuck) is highly prized, often hunted with seasons and limits. In North America, “furbearers” often have separate seasons, sometimes a separate license.

Because of numbers and voracious predation, rules for coyotes are usually liberal. It’s old Wile E. Coyote that calls up the power question on varmint cartridges. From small gophers to the largest woodchuck, any of the rimfires on up are powerful enough, just a matter of how close you must get.

Coyotes are different, pound for pound for pound very tough animals. Power doesn’t matter so much if the encounter is close. However, unless one is calling, coyote encounters aren’t often close. For me, coyote hunting is a centerfire game. Which one depends on required range, and whether pelt damage is a concern. Serious callers (which I am not) often use shotguns with heavy charges of coarse shot. Easier to hit moving coyotes coming to the call, and minimal pelt damage past 25 yards.

The .17 Remington was developed in Australia, no coyotes but problems with non-native foxes. Light, frangible .17-caliber bullets tend to enter and come apart without exiting, so wonderfully effective without ruining the pelt. The popular .17 HMR rimfire is an awesome medium-range varmint cartridge, but marginally powerful for coyotes unless the shot is close. Today we have centerfire .17s from .17 Hornet up through grand-dad .17 Rem. Plus the rimfire .17 Winchester Super Magnum and the .22 WMR. All are adequate for coyotes, effective range depending on velocity. Above that, the .204 Ruger and all the .22 centerfires are fine for coyotes.

I do little specific coyote hunting. The majority I take are targets of opportunity while hunting other game. This means I’m usually carrying a centerfire adequate for deer-sized game. Effective for coyote control, but don’t expect salvageable skins. A partial compromise is to use a milder .22 centerfire like the .223 Rem with non-expanding military or FMJ match bullets. Caliber-size entrance and exit holes are common. Just check your regs; non-expanding bullets aren’t legal for hunting in some jurisdictions. Also, poor choices for other varminting. Frangible “varmint” bullets aren’t quick-expanding just for explosive effect; also, to reduce ricochet.

The varmint hunting I know best is small rodents: Ground squirrels in California, prairie dogs on the Great Plains, both found in colonies. I’ve done some rockchuck shooting in the West, but I can count all the woodchucks I’ve shot without taking my shoes off. Power isn’t an issue. I’ve had great fun shooting prairie dogs with .22 Long Rifle hollowpoints, Some serious Eastern hunters make a game of stalking woodchucks with rimfires.

Wherever, shooting rodents isn’t about raw power, but about accuracy and range, which sort of go together. Prairie dog shooting is perhaps the most demanding of raw accuracy. Small targets open country, usually windy. An adult prairie dog might offer a target as much as twelve inches nose to tail, more like three inches from brisket to backline. Presentation may be anything, but is usually either standing vertically, or horizontal. Either way, there’s a large target in one direction, very small the other.

We typically judge rifle accuracy by average group size. In America, usually at 100 yards. For a hunting rifle, the Holy Grail is generally one Minute of Angle (MOA), even for mountain game. One MOA means one inch at 100 yards, natural dispersion spreading to two inches at 200 yards, three inches at 300 yards, and so forth.

On the windy prairies, and with animals often moving while bullets are in flight, there’s no such thing as hitting prairie dogs with every shot. I prefer hitting to missing. When I inevitably miss, I like to understand why, then correct with the next shot. Doesn’t do me any good to miss because I’m out of accuracy. So, for a general-purpose prairie dog rifle, one MOA accuracy isn’t enough. That means I’m beyond Minute of Prairie Dog at 300 yards. That’s a fair poke on a prairie dog-sized target, nobody hits them all. However, if you start with one-inch groups at 100 yards, naturally expanding groups will cause misses beyond 300 yards. Since I like hits better than misses, I expect a serious prairie dog rifle to do better. No such thing as too much accuracy for small varmints. Also, no limited to how far one can shoot at prairie dogs! Only a few blessed and gifted rifle barrels will deliver one half MOA groups on a consistent basis, but that’s the goal.

It’s not about cartridges. However, my heavy-barreled Ruger No. 1 in .204 Ruger will do that. In May 2024, I was delighted to see that friend and prairie dog shooting partner Gordon Marsh found a No. 1 in .204 that will also do that. I’ve had various other .22 centerfires that grouped as well or better, also 6mms and some larger cartridges.

That level of accuracy is not essential. It’s just that, with less accuracy, effective range is limited. Well, absent wind-bucking and trajectory-flattening velocity, range is limited anyway. On prairie dogs, that’s part of the fun; just depends on how personal you take misses.

The last time I shot prairie dogs with a .22 rimfire was with a Ruger 10/22 target rifle. It averaged .75-inch 50-yard groups across several loads. Theoretically, Minute of Prairie Dog to 400 yards. Between ridiculous holdover, huge wind deflection, and long flight time, you’re not going to hit many prairie dogs at 400 yards with a .22 Long Rifle. Once I figured holdover and wind, it was deadly at 100 yards, and I was surprised at how consistently I could hit at 150 yards. Then, I was done, time to break out a faster cartridge.

In our prairie dog group, Bill Green and Ronnie Whitten love their .17 HMRs. Amazing accuracy, uncanny performance. I’ve seen them hit prairie dogs at 300 yards too often to be flukes. However, the .17-caliber’s light bullets are extremely susceptible to wind, great training to learn to deal with it, but the .17 HMR is pretty much done at 200 yards.

This year, Gordon borrowed another page from my book and also brought a CZ .22 Hornet. Introduced in 1930, the Hornet is America’s first factory varmint cartridge. Despite its archaic rimmed, tapered case, it is shockingly accurate and surprisingly fast; lighter bullets can be loaded to nearly 3000 fps. Fitted with a suppressor, the little Hornet turned out to be Gordon’s primary prairie dog rifle this year. When it was calm, I was impressed to see how consistently he was hitting clear to 300 yards. When the wind came up, he was done, needed something faster.

Since power isn’t an issue, prairie dogs can be shot with anything that’s accurate enough. Kansas friend Vance Cain told me he used to shoot prairie dogs with his .458. When I was a kid, I shot a lot of prairie dogs with my .264, and my “go-to” was a .243. Many folks use various 6mms and .25-calibers with light bullets. The .22-250 reigns as the most popular “fast” varmint cartridge. I used the .22-250 for years, and Gordon always has his heavy-barreled Savage .22-250, his “big gun,” brought out when the wind comes up or only distant ‘dogs are visible.

There are many great varmint cartridges: All the .17s, .20s, .22s, even the 6mms and .25s if one prefers. Some are old, some new. Both the 6mm ARC and brand-new .22 ARC have been wonderfully successful. The .22 ARC has similar velocity to .22-250, but AR-compatible, and barreled with faster twist to use heavier bullets, which buck wind better, but produce more recoil.

Unlike much varmint shooting, prairie dogs tend to offer multiple opportunities. So, for me the ideal prairie dog rifle has lots of reach, but mild enough recoil to allow calling shots through the scope. Call the wind, take the shot, see the strike, reload and adjust. The .223 allows this. Unless very heavy, the .22-250 bounces just a bit too much, as do all larger cartridges. The .204 is faster but, with lighter bullets, has less recoil; it has become my favorite all-around varmint cartridge.