Sig Sauer Elite Performance Match, 300 Blackout, 125 Grain, Open Tip Match, 20 Round Box E300A1-20 SIG SAUER supersonic rounds feature a 125gr Sierra Match King Projectile for superior accuracy and minimal dispersion when suppressed. Consistent bullet weight retention with minimal velocity variation results from optimized shell case metallurgy with premium primers. Rounds are precision loaded using state-of-the-art, electromechanical monitoring for geometric conformity.