An excavator bucket is a large, heavy-duty attachment typically made of thick steel,

A 50 Cal sniper rifle fires powerful rounds that can penetrate many materials. While an excavator bucket's steel is thick and tough, it is not designed for ballistic protection. It might absorb or deflect some bullets, especially if the bullets strike at an angle or hit thicker parts of the bucket, but it is not guaranteed to stop or reliably prevent penetration.