How did weatherby discover bolt safety issue with vanguard rifle?

Weatherby discovered a bolt safety issue with the Vanguard rifle during routine testing and quality control procedures. They found that under certain conditions, the bolt could fail to fully lock, potentially leading to accidental discharges. This prompted the company to implement a recall and enhance safety measures in their manufacturing process to ensure the reliability of the rifles. The incident highlighted the importance of rigorous testing in firearm safety.