The Weatherby 307 Builders Action Magnum is a bolt-action barreled action offered in a standard configuration with a black finish. It is sold as a builders action, meaning it is intended for custom rifle builds rather than as a complete rifle. The standard profile accommodates a range of magnum chamberings per the builder's preference. 
 

Key Specifications 

• Brand: Weatherby 
• Model: 307 Builders Action Magnum 
• Action: Bolt Action 
• Configuration: Builders Action (barreled action) 
• Finish: Black 
   

Detailed Features 

• Bolt-action platform based on the 307 action 
• Magnum-capable action for a range of chamberings 
• Standard profile configuration 
• Black finish on metal components 
• Intended for custom or builder rifle projects

Buyers of the Weatherby 307 Builders Action Magnum are almost exclusively custom rifle builders or gunsmiths looking for a quality bolt-action starting point. The 307 action draws praise for its smooth cycling and robust magnum-length bolt face, and most builders report it accepts aftermarket triggers and stocks without significant fitting work.

The common complaint is availability and lead time. Builders who want a specific chambering sometimes wait longer than expected to source a compatible barrel, which extends project timelines. A minority of buyers also note that factory support documentation is sparse compared to more established platforms.

For value, the 307 Builders Action sits at the upper end of the builders-action market. Those who complete builds with it generally consider the quality worth the cost, though occasional buyers who expected a more turn-key experience express disappointment at how much additional investment is required.