Atomic .300 Winchester Magnum 220gr Sierra MatchKing HPBT Ammo

The Atomic .300 Winchester Magnum 220gr Sierra MatchKing HPBT load (Atomic part no. 00403) pairs a flat-shooting magnum cartridge with a genuine match-grade bullet for shooters who want serious long-range precision. Atomic builds this round around the Sierra MatchKing hollow point boat tail, a bullet trusted by competitive and precision shooters for consistent, predictable flight from box to box. Reloadable brass cases let handloaders recover and rebuild fired brass instead of buying new every trip. Whether you are stretching a .300 Win Mag out to distance on a precision rifle or confirming zero before a hunt, this load carries the accuracy pedigree the MatchKing name is known for.

Key Specifications

• Chambered in .300 Winchester Magnum, a flat-shooting magnum cartridge with plenty of reach for long-range work.
• Loaded with a 220-grain bullet that carries strong retained energy well past 500 yards.
• Built around the Sierra MatchKing hollow point boat tail design, prized for match-grade consistency and a high ballistic coefficient.
• Rated at 2600 fps muzzle velocity, giving a flat trajectory for extended-range shooting.
• Ships in reloadable brass cases, letting handloaders recover and rebuild spent brass.
• Packaged 20 rounds per box for a manageable range-day supply.
• Sold 10 boxes per case for shooters who want to stock up in bulk.
• Works out to roughly $2.88 per round, competitive pricing for a match-grade magnum load.
• The boat-tail base reduces drag in flight, helping the bullet buck wind and hold velocity at extended distances.

Frequently Asked Questions

Is this ammunition reloadable? Yes, it ships in reloadable brass cases, making it a solid option for handloaders who want to recover components.

What is the muzzle velocity? Atomic rates this load at 2600 fps out of a .300 Winchester Magnum barrel.

What bullet does this load use? A 220-grain Sierra MatchKing hollow point boat tail, a proven match-grade bullet built for long-range accuracy.

Buy the Atomic .300 Winchester Magnum 220gr Sierra MatchKing HPBT Ammo

A magnum cartridge is only as good as the bullet riding on top of it, and the Sierra MatchKing has earned its reputation on the firing line. Stock up for your next trip to the range or the mountains. Order from our Lubbock, Texas gun shop and it ships fast to your door.