Blackout Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing, 160 Round Bucket

The 300 Blackout Subsonic 220gr Sierra MatchKing bucket is 160 rounds of the most proven match bullet in the cartridge for $289.00, about $1.81 a round. It is the quiet, accurate, high volume load for suppressed carbines: home defense training, precision practice, suppressor work and match days. This page covers what the load does, what it does not do, and how to run it in a gas gun.

The 220 grain MatchKing in one paragraph

A 220 grain boat tail hollow point loaded in factory new brass to about 1,030 feet per second, with a G1 ballistic coefficient near 0.62. It stays subsonic from every common barrel, groups as well as the rifle allows, and is the round most 300 Blackout owners think of when they say subsonic. The 300 Blackout Subsonic 220gr bucket is that load in bulk.

Loaded, gauged and inspected on the same line as the 20 round box, with a match primer and a charge weight held to tight tolerance. Bucket packing strips out the cost of eight retail boxes and passes it to you.

Why the MatchKing is the reference bullet

Sierra’s MatchKing line has held national and world records for decades. The 220 grain .308 version was adopted early by 300 Blackout developers because its length and weight suited the subsonic case capacity perfectly, and it has been the benchmark since. The jacket is thin and uniform, the core is drawn to a tight weight tolerance, and the hollow point is a manufacturing feature rather than an expansion device.

Consistency is what you are buying. Ten rounds from the bucket will weigh, measure and fly the same. That makes the load ideal for the jobs where the ammunition must not be the variable: zeroing, suppressor point of impact testing and diagnosing a rifle. the cartridge’s history shows how central the 220 grain load has been to the cartridge from the start.

Velocity, energy and trajectory

Barrel	Muzzle velocity	Energy	Drop at 150 yd (100 yd zero)	Drop at 200 yd
9 inch	About 960 fps	About 450 ft lbs	About 14 inches	About 40 inches
12 inch	About 1,000 fps	About 490 ft lbs	About 13 inches	About 37 inches
16 inch	About 1,030 fps	About 518 ft lbs	About 12 inches	About 35 inches

Also in 300 Blackout Buckets: Blackout Ammunition .300 Blackout 110gr Nosler Varmageddon, 160 Round Bucket, Blackout Ammunition .300 BlackOut 125gr Punisher Series, 160 Round Bucket and Blackout Ammunition .300 Blackout 110gr Barnes TAC-TX, 160 Round Bucket. Load guide: 300 Blackout ballistics chart.

Rounded from the 300 Blackout ballistics chart; run your exact barrel through the ballistics calculator. The practical range of any subsonic is about 150 yards before drop becomes severe. Inside that, the 300 Blackout Subsonic 220gr MatchKing is as accurate as anything in the caliber. Our barrel length guide explains how much velocity each inch of barrel adds.

Not a hunting bullet

Sierra states plainly that MatchKing bullets are not recommended for hunting, and at 1,000 feet per second the point is even sharper. The bullet does not expand at subsonic speed. It punches a caliber sized hole and keeps going. That is fine on paper and steel and wrong on an animal. Use a bullet built to open at subsonic velocity for game.

Shipping, tax and age

Ships to your home address in all 50 states. No tax stamp, no NFA paperwork, no dealer transfer and no tax added at checkout. Orders over $300 ship free. Ammunition is not an NFA item. Under federal law at 18 U.S.C. 922 no federal licence is required to buy it and there is no waiting period. Buyers must be 21 or older for rifle ammunition and an adult must sign at delivery. The bucket weighs about 10 pounds packed and ships by ground carrier under 49 CFR 173.63 limited quantity rules.

Details on the shipping and delivery page and the FAQ. Ammunition cannot be returned once shipped; the returns policy covers damaged deliveries. Every load meets SAAMI standards, and the wider 300 Blackout ammo range is a click away.

For the reference subsonic in bulk, the 300 Blackout Subsonic 220gr Sierra MatchKing bucket is the one to order.

Frequently asked questions

Is the 300 Blackout Subsonic 220gr Sierra MatchKing bucket a hunting load?

No. Sierra is explicit that MatchKing bullets are not designed for hunting. This is a match and training load. For game or defense, use the 205gr Punisher Series or 196gr fracturing rounds, which are built to open at subsonic velocity.

How many rounds are in the 300 Blackout Subsonic 220gr bucket?

160 rounds loose in a resealable plastic bucket, with no inner boxes. The bucket keeps rounds dry and doubles as a range container.

Will it cycle a gas gun without a suppressor?

Not always. Subsonic loads run at lower pressure and many AR pattern rifles need a suppressor’s back pressure, an adjustable gas block or a lighter buffer to cycle them fully. With a can fitted most rifles run it fine.

What velocity does the 300 Blackout Subsonic 220gr load run?

About 1,030 feet per second from a 16 inch barrel with about 518 foot pounds of energy. Shorter barrels lose a little speed: expect about 960 feet per second from a 9 inch pistol barrel.