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.