The Weatherby Model 307 MZY .50 caliber muzzleloader (brand part no. 3MZY01N50R8B) brings Weatherby’s centerfire-style precision to the front-loader hunter. Weatherby built it on the Model 307 action with a spiral fluted bolt and barrel, all in Graphite Black Cerakote. The .50 bore is the traditional big-game muzzleloader caliber, and a 26-inch barrel plus a 2-inch brake gives it a 28-inch barrel assembly. A sealed Arrowhead Gen2 ignition handles primer-module loading, and the whole rifle weighs about 7.1 pounds.

Key Specifications

• The caliber is .50, the traditional bore for big-game muzzleloading with the 340-grain Hornady Bore Driver Weatherby recommends.
• The barrel is 26 inches plus a 2-inch brake, for a 28-inch barrel assembly.
• The twist rate is 1:24 for the .50 caliber chambering.
• The weight is 7.1 pounds, with an overall length of 45 inches.
• The muzzle is threaded 3/4-24 for the brake.
• The barrel is a number 4 contour with a spiral fluted profile.
• The ignition is the Arrowhead Gen2 system, which uses reusable primer modules and large rifle primers.
• The trigger is a TriggerTech unit adjustable down to 2.5 pounds, with a two-position safety.
• The bolt uses a three-piece design with tool-less takedown.
• The finish is Graphite Black Cerakote over a Peak 44 carbon fiber stock with a 13.25-inch length of pull.

Frequently Asked Questions

What is the difference between this and the .45 caliber model? The bore and rifling: this one is .50 caliber with a 1:24 twist and pairs with a 340-grain bullet, while the .45 uses a 1:20 twist and a 280-grain bullet.

Is the brake adjustable? Weatherby describes the MZYbrake as a side-ported, self-timing brake with a timing nut, so you can time it without a gunsmith.

What comes in the box? Weatherby lists unprimed primer modules, a breech plug wrench and socket, and Cedar Mountain Quick Loaders.

Buy the Weatherby Model 307 MZY .50 Caliber Muzzleloader, 26-Inch Barrel with Brake

A .50 caliber front-loader with a sealed ignition and a quiet-recoil brake suits a serious season in the field. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your door, and see more muzzleloader rifles.