[Chuck Dye]

From Oregon’s website:

ARMS AND AMMUNITION REQUIREMENTS
635-065-0700
Rifles
Hunters shall only use: (1) Any .24 caliber or larger centerfire rifle that is not fully automatic to hunt bighorn sheep, Rocky Mountain goat, or elk. Semiautomatics shall have a magazine capacity of no more than five cartridges.
(2) Any centerfire rifle .22 caliber or larger that is not fully automatic to hunt pronghorn antelope, black bear, cougar (mountain lion), or deer. Semiautomatics shall have a magazine capacity of no more than five cartridges.
(3) Any rifle that is not fully automatic to hunt western gray squirrels.
(4) For hunting seasons designated as rifle hunts, hunters shall use only firearms legal for that species:
(a) A person hunting deer with either a western Oregon deer rifle tag or eastern Oregon deer rifle tag shall use a legal centerfire or muzzleloading rifle, a shotgun, or a centerfire handgun.
(b) A person hunting elk with any elk rifle tag shall use a legal centerfire or muzzleloading rifle, a shotgun, or a centerfire handgun.
(c) (5) Hunters shall not use military or full metal-jacket bullets in original or altered form.

Shotguns
Hunters shall use:
(1) Any shotgun, including those with rifled barrels, with number 1 or larger buckshot or slugs to hunt pronghorn antelope, black bear, cougar (mountain lion), or deer.
(2) Any shotgun, including those with rifled barrels, using slugs (single projectile) to hunt elk.
(3) Any shotgun to hunt western gray squirrels.

Muzzleloading Firearms
During controlled muzzleloader only seasons:
(1) Hunters shall use any long gun that:
(a) Is fired from the shoulder;
(b) Is loaded from the muzzle;
(c) Has an open ignition system;
(d) Is a single shot except for muzzleloading shotguns that may be double barreled;
(e) Has only open or aperture (peep) sights.
(2) Hunters shall use only round ball, conical lead or lead alloy bullets whose length does not exceed two times the diameter.
(3) Hunters shall use only flint or percussion caps as a source of ignition.
(4) Hunters shall use only loose or granular black powder or black powder substitutes as propellants.
(5) Any .40 caliber or larger muzzleloader as described in OAR 635-065-0705 (1-4) to hunt pronghorn antelope, black bear, cougar (mountain lion), or deer.
(6) Any .50 caliber or larger muzzleloader as described in OAR 635-065-0705 (1-4) to hunt bighorn sheep, Rocky Mountain goat, or elk.
(7) Hunters shall use only number 1 or larger buckshot or bullets as described in OAR 635-065-0705 (2) for hunting deer, black bear or cougar (mountain lion).
(8) Hunters shall use only single projectiles as described in OAR 635-065-0705 (2) for hunting pronghorn antelope, elk, bighorn sheep, or Rocky Mountain goat
(9) Hunters may only use a legal muzzleloading firearm as described in OAR 635-065-0705. During centerfire firearms seasons where muzzleloaders are also a legal firearm, hunters may:
(a) Use any .40 caliber or larger muzzleloading firearm to hunt pronghorn antelope, black bear, cougar (mountain lion), or deer.
(b) Use any .50 caliber or larger muzzleloading firearm to hunt bighorn sheep, Rocky Mountain goat, or elk.
(c) Use any muzzleloader ignition type (excepting matchlock), any sight, any propellant, or any bullet type.

Handguns
Hunters shall use:
(1) Any centerfire handgun .22 caliber or larger that is not fully automatic to hunt pronghorn antelope, black bear, cougar (mountain lion), or deer.
(2) Any centerfire handgun .24 caliber or larger that is not fully automatic to hunt bighorn sheep, Rocky Mountain goat, or elk.
(3) Any handgun that is not fully automatic to hunt western gray squirrels.
(4) Hunters shall not use military or full metal-jacket bullets in original or altered form.