Sheridan, WY – June 25th, 2026 Weatherby proudly announces the launch of the Model 307 MZY, the company’s first production muzzleloader in its 80 year history. Built on a modified Model 307 action and featuring the innovative Arrowhead Rifles Gen2 ignition system, the Model 307 MZY delivers a new standard of accuracy, reliability, and consistency for black powder hunters.
Designed specifically for hunters who refuse to compromise performance during muzzleloader seasons, the Model 307 MZY combines modern rifle technology with proven muzzleloading capability. The result is a precision hunting tool that offers cleaner operation, tighter velocity spreads, and dependable cold-weather performance when paired with BlackHorn 209 powder.
At the heart of the Model 307 MZY is a modified Model 307 action engineered to accept Arrowhead Rifles’ Gen2 sealed primer-based ignition system. Traditionally found only in custom muzzleloaders, the system utilizes precision-fit primer modules loaded with large rifle primers rather than conventional 209 primer systems. This design creates a hotter, more consistent ignition through a short, straight flame path while fully sealing the breech. The sealed system eliminates blowback into the action, maintains repeatable headspace, and significantly reduces maintenance compared to traditional muzzleloader ignition systems. The result is cleaner operation, improved consistency, and reliable performance across a wide range of hunting conditions.
“We are excited to launch Weatherby’s first ever muzzleloader. The Model 307 MZY feature set and price point fill a gap in the market for those who want maximum performance without full-custom-build pricing. I’m also very excited for options to extend hunting season by applying for more attainable tags in western states.”
-Luke Thorkildsen Weatherby Chief Operating Officer
Every Model 307 MZY comes equipped with a Peak 44 Bastion carbon fiber stock, TriggerTech adjustable trigger, MZYbrake muzzle brake, and a lightweight collapsible ram rod. The Peak 44 Bastion stock and MZYbrake work together to dramatically reduce felt recoil, helping hunters maintain confidence and accuracy when shooting heavy muzzleloader projectiles. The TriggerTech adjustable trigger provides the same crisp, consistent trigger pull trusted by hunters across the entire Model 307 lineup.
Hunters can choose between no sights or a factory-installed Williams Gunsight Standard Sight system, with additional precision sight upgrades available. The Model 307 MZY is optimized for Blackhorn 209 powder and is available in both .45 caliber and .50 caliber configurations.
Model 307 MZY Features
-Built on a modified Weatherby Model 307 action
-Arrowhead Rifles Gen2 sealed ignition system
-Optimized for Blackhorn 209 powder
-Available in .45 caliber and .50 caliber
-Twenty reusable primer modules included
-Peak 44 Bastion carbon fiber stock
-TriggerTech adjustable trigger
-MZYbrake included
-Lightweight collapsible ram rod with carrying pouch
-Cedar Mountain Quick Loader included
-Williams Gunsight sight options available
-Designed for compliance in most western muzzleloader seasons*
*”Regulations vary by state and may change. Hunters should always consult their state wildlife agency for current muzzleloader regulations. Weatherby is not responsible for regulatory changes or compliance requirements.”
About Weatherby
Founded in 1945, Weatherby, Inc. is a family-owned company that continues to fuel the passion of hunters and shooters around the globe by building some of the world’s finest firearms. With a legacy of setting new standards in ballistics and performance, the company is committed to redefining excellence on the range and in the field. The Weatherby line features the Model 307, legendary Mark V rifles, accessible and popular Vanguard® rifles as well as shotguns like the SORIX, Orion®, Element®, and 18i®. Weatherby’s premium ammunition and shooting accessories are also the choice for discerning shooters worldwide. The company is based in Sheridan, WY, and invites all hunters and shooters to follow them on social media at @weatherbyinc on Facebook and Instagram. For more information about Weatherby, please visit weatherby.com.
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