SIG is rounding out its .300 Blackout lineup with the introduction of SIG-branded Elite Performance Ammunition in the caliber. From the press release:

SIG SAUER^® Introduces 300 Blackout Elite Performance Ammunition

Newington, NH (January 12, 2015) – SIG SAUER, Inc. is pleased to introduce 300 Blackout Elite Performance Ammunition Match Grade Centerfire Cartridges, the company’s first rifle ammunition product. Designed for the AR-15 platform, this subsonic round features a 220gr Open Tip Match (OTM) bullet with the SIG SAUER proprietary lead/alloy core for improved accuracy. This low-recoil cartridge is ideal for use with a silencer, which greatly reduces sound signature and muzzle flash, making it a favorite among target shooters who want to protect their hearing and tactical shooters who want to minimize noise and flash signatures. Additionally, a significant number of modern sporting rifle hunters also favor this cartridge for limited hunting applications.

“The subsonic, 220-grain 300 Blackout is fun to shoot, especially using a silencer, and extremely popular with those who want reduced sound and muzzle flash,” said Bud Fini, vice president of marketing for SIG SAUER. “Fans of the 300 Blackout also appreciate the convenience of being able to use standard 5.56 NATO AR magazines with 300 Blackout rounds without a reduction in capacity. And, if they don’t already own a modern sporting rifle chambered in 300 Blackout, all they have to do is change the uppers of their AR-15 to convert.”

Additional offerings in Elite Performance rifle ammunition will be introduced throughout 2015, including a supersonic load for the 300 Blackout.

It seems several companies are finding it potentially profitable to introduce their own ammunition lines. SIG follows SilencerCo, G2 Research, Lapua, and Noveske into the .300 Blackout game.

.300 AAC Blackout has by far been the most successful rifle caliber introduction in the past couple of decades. I attribute this to good use of existing components (.30 caliber barrels, AR-15 bolts and magazines, etc) and good product distribution early on.