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Colorado’s muzzleloader regulations are laid out extremely well and are very direct:
Only legal muzzleloaders are allowed during muzzleloader seasons;
In-line muzzleloaders are legal;
Must be a single barrel that fires a single conical projectile or round ball;
For deer, antelope, and bear, a conical projectile must be at least .40 caliber and a round ball must be at least .50 caliber;
For elk and moose, conical bullets must be at least .50 caliber and round balls must be at least .54 caliber;
From .40 to .50 caliber, bullets or round balls must weigh at least 170 grains;
If greater than .50 caliber, a bullet or round ball must weigh at least 210 grains;
209 Shotshell primers and B.O.R Lock MZ System bullets are legal;
Pelletized powder systems are prohibited during muzzleloader seasons; and
Cannot be loaded from the breech during muzzleloader seasons.
Only open or iron sights are legal during muzzleloader seasons. Sights using fiber optics or fluorescent paints are legal. Scopes or sights using artificial light, batteries, and other electronics are prohibited during muzzleloader seasons.
Sabots are prohibited during muzzleloader season. Cloth patches are not considered sabots. Bullet designs such as the Powerbelt are legal for use.
Smokeless powder is prohibited during muzzleloader seasons. True black powder or black powder substitutes are legal.
Electronic or battery-powered devices cannot be attached or incorporated into a muzzleloader during muzzleloader seasons.