The Lee 277 Sig Fury Factory Crimp Die provides a firm, reliable crimp that securely holds the bullet in place, outperforming other crimping tools. Tests have shown that even bullets without a crimp groove benefit from this die, as the firm crimp improves accuracy. The crimp forces pressure to build to a higher level before the bullet begins to move, resulting in a more uniform pressure curve. This leads to less velocity variation and ultimately enhances the consistency and accuracy of your ammunition. The Lee 277 Sig Fury Factory Crimp Die is designed to deliver precise performance for reloaders seeking optimal results in every shot.