Deer hunting caliber rules in Wyoming
What Wyoming allows you to shoot a deer with, in plain English, taken from the state's own regulation and quoted below so you can check our reading against it.
A plain-English summary, last reviewed September 2026. Hunting law changes every year and varies by zone, season and public versus private land, and this page is not legal advice. Before you hunt, confirm the current rule with Wyoming Game and Fish Department.
The state sets a floor - a minimum caliber, bullet weight or muzzle energy - that small cartridges can fail.
The rule as Wyoming writes it
For the taking of antelope or deer a hunter shall use any center-fire firearm of at least .22 caliber, excluding the .22 Hornet, having a bullet weight of at least sixty grains and firing a cartridge of at least two inches in overall length and using an expanding point bullet; or any other cartridge of at least .35 caliber and at least one and one-half inches in overall length using an expanding point bullet; or a muzzle-loading rifle or handgun of at least .40 caliber firing an expanding point bullet or lead ball with at least fifty grains of black powder or its equivalent; or a shotgun firing 00 or larger buckshot, or a slug.
Is a .223 legal for deer in Wyoming?
The cartridge must carry a bullet of at least 60 grains, in a case at least two inches overall, with an expanding point. The common 55 grain .223 load is therefore out, while a 60 grain or heavier expanding load qualifies. The .22 Hornet is excluded by name.
What is the minimum caliber for deer in Wyoming?
Wyoming does set a floor: at least .22 caliber excluding the .22 Hornet, with a bullet of at least 60 grains in a cartridge at least two inches overall, or any cartridge of .35 caliber and at least one and a half inches. The rule in full, including the shotgun and muzzleloader options, is quoted at the top of this page, and the regulation itself is linked in the sources.
What a caliber or energy floor means for your rifle
Here the state writes a number into the rules: a minimum caliber, a minimum bullet weight, a minimum muzzle or downrange energy, or a combination. That number is what makes a cartridge legal or illegal, and it can rule out a rifle that is perfectly legal one state over.
Energy floors are the ones people get wrong. Energy depends on the load, not the caliber, so two boxes of the same cartridge can land on opposite sides of the line. The manufacturer's ballistics table is the document that answers the question, and it is worth printing the line for the load you carry.
If your cartridge sits near the limit, the safer move is to step up rather than argue the arithmetic with a warden. Nothing in a citation improves the meat.
Caliber is the smallest part of a clean kill. Work out what your cartridge carries at the range you hunt with the cartridge and energy guide or the cartridge comparison tool, then put the shot where it counts.
States with the same kind of rule
The state sets a floor - a minimum caliber, bullet weight or muzzle energy - that small cartridges can fail.
The full picture is in the 50-state deer caliber table, and the regulations hub has the agency directory and a pre-hunt legal checklist.
Sources
We read this state's rule from the source below in September 2026 and quoted it above:
- Wyoming Game and Fish Commission, Chapter 32 Regulation Governing Firearm Cartridges and Archery Equipment, Section 4(b)
- Wyoming Game and Fish Department - the agency that publishes and enforces it.
Rules are summarised for orientation and change often; the official regulation linked above is the authority. Zones, seasons and local ordinances can add to the statewide rule: the regulations hub has the pre-hunt legal checklist.
Range-day gear, whatever your state allows
The rule quoted above tells you what is legal; these are the tools that make any legal setup accurate enough to matter.
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