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. Packaged in boxes of 1000.
Material: Copper Gilding Metal
Allows higher velocities with cast bullets.
Crimped on during bullet sizing, will fit .451 through .458 lead bullets that are designed for gas checks.
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