A New 1911 in .357 SIG, Fresh Line of Stag Arms .300 AAC BLK Rifles

SIG Sauer's 1911 Tactical Operator pistol is now available in .357 SIG. photo from SIG Sauer.

Two relatively new and increasingly popular cartridges have some new machines to launch their projectiles downrange.

According to this story on gundigest.com, SIG Sauer has released its 1911 Tactic Operator (TACOPS) pistol chambered in the powerful .357 SIG cartridge. Currently, the company offers its Fastback Nightmare 1911 model in the .357 SIG chambering, along with the traditional .45 ACP. It also offers other models of the revered semi-auto chambered in 9mm, .40 S&W, and even .38 Super, according to gundigest.com.

The single-action TACOPS in the new chambering has the same magazine capacity as it does in .45 ACP: 8+1, and it has the same features, such as Ergo XT grips, night sights, a black Nitron finish, and a checkered front strap. A threaded barrel is also available, the story says. The MSRP on the new TACOPS is $1,213.

The 1911 can be finicky about the kind of ammo it likes to eat, and many shooters find that the bottleneck design of the .357 SIG cartridge feeds extremely well in the more-than-100-year-old handgun design.

The cartridge, based on a .40 S&W case necked down to accept 9.0mm bullets, was designed by SIG Sauer with Federal Cartridge Company in 1994. The goal was to mimic the ballistics of a 125-grain .357 magnum load fired from a 4-inch barreled revolver in a cartridge for a semi-auto pistol with a high ammunition capacity.

The Model 3T, one of six Stag MSRs now available in .300 Blackout. photo from Stag Arms.

Also coming to a firing line near you: Stag Arms recently announced that its line of 16-inch barrel MSRs will be offered in .300 Blackout / 7.62x35mm, including the company's Model 1, 2, 2T, 3, 3T, and 3T-M series rifles, according to a release.

Each model's MSRP goes up only $50 for the new chambering, says this story from americanrifleman.com. Prices for the new rifles range from $1,015 to $1,205.

"In addition to the upper halves we offer in this caliber, we are now offering a complete AR-15 rifle using the .300 Blackout cartridges with heavier bullets, greater ballistics, and already on the shelves of most major stores," said Stag Arms president Mark Malkowski in a release.

The .300 AAC Blackout cartridge was designed by Advanced Armament Corporation for use in M4 carbines. Its goal is to achieve ballistics similar to the 7.62x39mm cartridge in an MSR platform while using standard NATO magazines at their normal capacity.

The 7.62x39mm often experienced feeding problems in the MSR platform unless specially modified AK-47-type magazines were used. Modified bolts were also needed to accommodate the larger case head and diameter. The 300 AAC nullified all of that and allowed for a much heavier bullet to be fired from a standard MSR platform effectively.