Lyman Gas Checks 35 Caliber Box of 1000

These gilding metal cups fit the cast bullet base and protect it from hot powder gases. Easily seated during bullet sizing, the gas checks also permit higher velocities. Crimp-on design. Package of 1000. Lyman Gas Checks are copper cups that crimp onto the base of cast bullets to protect them from the hot, burning gases that propel the bullet out of the barrel. Gas Checks also aid in the reduction of fouling by keeping less lead from being melted in the barrel.