Best Calibers for Hunting Columbian Ground Squirrel: Comparisons & Picks
Practical caliber picks for meadow shooting, mixed distances, and low-recoil varmint control in the West.
Choosing the best Columbian ground squirrel hunting calibers is mostly about matching your cartridge to distance, wind, terrain, and how much shooting you expect in a day. These squirrels are small targets, so precision matters more than raw power. In close pasture or meadow setups, mild rimfires usually make the most sense because they are affordable to shoot, easy on the shoulder, and less disruptive when you may be taking repeated shots. In wider alpine or subalpine country where wind and longer openings become a factor, flatter-shooting centerfires start to pull ahead. No matter what you carry, prioritize a safe backstop, clear target identification, and ethical shot placement on stationary or high-percentage opportunities. Regulations vary by state and area, including season structures, species protections, license requirements, non-toxic shot rules where applicable, and magazine or shooting-area restrictions, so always check local laws before hunting. Idaho specifically notes that Columbian ground squirrel is one of the ground squirrel species legal to hunt there, while many other ground squirrels are protected and require careful target verification.
Where/When: Columbian ground squirrels are typically found in the Rocky Mountain West, including parts of western Montana, Idaho, eastern Washington, southeast British Columbia, and mountainous portions of Oregon. They are commonly associated with alpine and subalpine meadows, grasslands, open pastures, and colony-style burrow systems, so hunters often look for fresh diggings, clipped vegetation, travel lanes between burrow openings, and feeding activity around meadow edges and gentle slopes. They are active during the day and return to burrows at night, which makes morning through early afternoon a common window for spotting movement, with weather, elevation, and local pressure influencing how visible they are. In many areas, action is most consistent after spring emergence and through the warmer active season, but timing varies a lot by elevation, snowmelt, and local regulations.
Caliber Comparisons
| Feature | .17 HMR | .22 LR | .22 WMR | .204 Ruger | .223 Remington |
|---|---|---|---|---|---|
| Recoil How much kick you can expect when firing. |
Very light | Very light | Light | Light | Light to moderate |
| Effective Range The distance at which the caliber remains accurate and lethal. |
Short to moderate | Close range | Short to moderate | Moderate to long | Moderate to long |
| Bullet Weight Range The range of bullet weights typically available for the caliber. |
17 to 20 gr | 30 to 40 gr | 30 to 50 gr | 24 to 40 gr | 35 to 77 gr |
| Versatility How well the caliber or gauge performs for other game species besides your primary target. |
Specialized varmint round | Great trainer and small game option | Useful crossover rimfire | Excellent dedicated varmint choice | Very versatile field cartridge |
| Ammo Availability How easy it is to find ammunition for the caliber. |
Usually good | Excellent | Good | Fair to good | Excellent |
.17 HMR
For many hunters, .17 HMR is the sweet spot for Columbian ground squirrel work. It solves the biggest problem with close-to-midrange varmint shooting: you want more reach and a flatter trajectory than .22 LR, but you do not necessarily want the blast, muzzle report, or cost of a centerfire. In open meadows where shots often stretch beyond typical rimfire comfort, .17 HMR stays practical while still offering light recoil and easy spotting through the scope. Choose it when you expect precise shooting from a bipod, pack, or portable bench and want a cartridge that rewards careful range estimation without punishing you for a full day behind the trigger.
PROS
- Very flat shooting for a rimfire
- Minimal recoil helps you stay on target
- Excellent for small targets in calmer conditions
CONS
- Ammo usually costs more than .22 LR
- Wind can move the light bullet at longer range
- Less versatile than a .223 Remington-class centerfire
Interesting Fact: .17 HMR became popular because it gave rimfire shooters noticeably flatter trajectory and more precision potential than traditional bulk .22 LR loads.
Consider this Caliber If…
Pick .17 HMR if most of your shots are in the moderate rimfire zone and you value accuracy, low noise compared with centerfire rifles, and easy follow-through. It is especially useful for hunters who want a dedicated squirrel or varmint rifle with a quality optic and who usually hunt when winds are mild to moderate. A 3-9x or 4-12x scope and dependable expanding loads are often a better fit here than cheap bulk ammo.
.22 LR
.22 LR is still the budget-minded classic for Columbian ground squirrel hunting, especially where shots are close, opportunities are frequent, and you want to practice a lot without burning through expensive ammunition. What it solves is volume shooting: you can spend more time in the field, confirm zero often, and keep recoil and report extremely mild. It matters most around farm edges, pastures, or shorter meadow shots where precise range control is realistic. The key to choosing .22 LR is being honest about distance. This is not the best choice for windy, wide-open country, but inside its comfort zone it remains one of the most enjoyable and accessible options available.
PROS
- Low ammo cost encourages practice and high shot counts
- Very mild recoil and report
- Rifles, magazines, and optics options are widely available
CONS
- Trajectory drops quickly as distance grows
- Wind drift becomes a major issue
- Requires discipline on shot distance and placement
Interesting Fact: Many hunters become better field marksmen with .22 LR simply because affordable ammunition lets them practice more positions and more real-world distances.
Consider this Caliber If…
Choose .22 LR if you hunt compact areas, prefer minimal noise, or want the least expensive path into Columbian ground squirrel hunting calibers. Standard or high-velocity loads can work, but consistency matters more than headline velocity. Pair it with a rifle that groups well with your chosen load, and treat it as a close-range precision tool rather than a do-everything answer.
.22 WMR
.22 WMR fills the gap for hunters who like rimfires but need a little more reach and punch than .22 LR. It solves the common issue of squirrels hanging just far enough out that .22 LR starts to feel limiting while a centerfire still seems like more rifle than the setup requires. In mixed terrain with shots that vary from close burrow mouths to moderate meadow distances, .22 WMR is a practical compromise. It hits harder than .22 LR, carries better downrange, and still keeps recoil low. The main choice point is ammunition selection: some rifles strongly prefer specific loads, so testing a few options before season is worth the effort.
PROS
- More range and authority than .22 LR
- Still easy to shoot accurately with low recoil
- Good all-around rimfire option for varied field distances
CONS
- Ammo usually costs notably more than .22 LR
- Not as flat as .17 HMR or centerfire varmint rounds
- Some rifles can be load-sensitive
Interesting Fact: .22 WMR has stayed relevant for decades because it offers a clear step up from .22 LR without asking the shooter to move into centerfire rifles.
Consider this Caliber If…
This is a strong fit if you want one rimfire for rabbits, pest control, and Columbian ground squirrels while keeping recoil light and field handling simple. Look for accurate 30- to 40-grain loads, a solid rest, and realistic shot limits. Hunters who do not want to jump to .223 Remington often find .22 WMR gives them enough extra confidence for the way they actually hunt.
.204 Ruger
When your biggest challenge is open-country distance, .204 Ruger deserves serious attention. This caliber solves the problems rimfires struggle with most: wind drift, longer shots across broad meadows, and the need for a flatter hold without constant turret work. It matters on days when squirrels are visible but not willing to let you get close, or when the country is so open that a rimfire forces too many passes. .204 Ruger offers light recoil for a centerfire, fast bullets, and excellent varmint performance, making it a purpose-built pick for hunters who treat ground squirrel shooting as a precision game. The trade-off is ammo cost and slightly narrower availability than .223 Remington.
PROS
- Very flat trajectory for longer meadow shots
- Low recoil for a centerfire varmint rifle
- Excellent option when wind and distance matter
CONS
- Ammo is usually less common than .223 Remington
- More blast than rimfires
- Best used where longer shots are actually needed
Interesting Fact: .204 Ruger earned a loyal following among varmint shooters because it combines very high velocity with recoil light enough for many shooters to watch impacts through the scope.
Consider this Caliber If…
Pick .204 Ruger if you hunt broad western meadows, expect frequent crosswinds, and want a dedicated long-range varmint setup. A heavier-barreled rifle, steady bipod, and repeatable optic make the most of what this cartridge does well. It is less about casual wandering and more about deliberate, high-precision shooting from set positions.
.223 Remington
If you want one of the most versatile Columbian ground squirrel hunting calibers, .223 Remington is hard to ignore. It solves the problem of mixed-use ownership: you may want a rifle that handles squirrels well, but can also serve for coyote calling, range practice, and general varmint duty. It matters in open country where shots may stretch, winds may rise, and you want broad ammo choices from lighter varmint bullets to heavier match-style loads for paper practice. Compared with specialized rounds, .223 Remington is easy to live with. Recoil is still manageable, rifles are common, and ammunition is usually easier to find than more niche varmint calibers.
PROS
- Excellent ammo and rifle availability
- Works well from moderate to long varmint distances
- Highly versatile beyond ground squirrel hunting
CONS
- More muzzle blast than rimfires
- Can be more rifle than necessary for close shots
- Heavier rifles are often preferred for extended strings
Interesting Fact: .223 Remington remains a top seller partly because it balances low-ish recoil, easy accuracy, and broad load selection better than many specialty cartridges.
Consider this Caliber If…
Choose .223 Remington if you want maximum flexibility and do not mind stepping up from rimfire noise and cost. It is a smart answer for hunters who may only own one varmint-style rifle, especially if they split time between range work and field use. For Columbian ground squirrels, lighter varmint loads usually make the most sense, and a stable rest helps you capitalize on the cartridge’s reach.
Final Thoughts
For most hunters, the best pick comes down to how far they realistically shoot. .22 LR is the economy choice for close work and practice-heavy days. .17 HMR is arguably the best dedicated rimfire balance of flat trajectory and precision. .22 WMR is the practical middle ground for hunters who want more than .22 LR without going centerfire. .204 Ruger shines when the country opens up and wind starts working against you. .223 Remington is the most flexible all-around option if you want one rifle that can do more than just squirrel duty. Whatever you choose, sight in carefully, learn your holds, wait for stable shot angles, and keep safety first in open country where livestock, roads, rocks, and long sightlines can complicate every trigger press. Because regulations and protected-species rules vary, verify that you are targeting Columbian ground squirrel specifically and review current local laws before heading out.