Sig Sauer Elite Performance Match Grade 300 AAC Blackout Ammo 220 Grain Sierra MatchKing Jacketed Hollow Point

Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.

Sig Sauer Elite Performance Match Grade 300 AAC Blackout subsonic ammo pairs the 220-grain Sierra MatchKing jacketed hollow point with a precision-metered powder charge that holds 1000 fps from an 8-inch or longer barrel. At that velocity, rounds stay subsonic through standard atmospheric conditions, eliminating the sonic crack and minimizing suppressor back-pressure. The MatchKing’s boat-tail hollow-point profile resists wind drift and maintains stable flight out to 200 yards, making this load a benchmark for suppressed carbine work where accuracy and low signature matter equally. 300 AAC Blackout subsonic ammo delivers both without requiring special bolt components or adjustable gas blocks — simply load, charge, and fire.

Performance at a Glance

Sig Sauer meters each charge electrostatically and monitors case neck tension in-line to hold shot-to-shot velocity spreads under 20 fps. That consistency translates to vertical stringing of less than one MOA at 100 yards when fired from a stable platform. The Sierra MatchKing projectile uses a tangent ogive and a .496 G1 ballistic coefficient, making external ballistics predictable across varying distances. Brass cases are annealed after drawing and accept standard large-rifle primers during reload cycles. Boxer primers simplify decapping, and the non-corrosive propellant burns clean enough that carbon buildup on piston heads and baffles stays manageable through multi-magazine strings.

This load sits in the middle of the 300 Blackout ammo subsonic spectrum — heavier than 190-grain hunting rounds but lighter than the 240-grain barrier loads. It balances retained energy at distance with magazine capacity, allowing full 30-round STANAG magazines without compression issues or feed-lip stress.