7mm STW Ammo

Intended Use

The 7mm STW is primarily used for big game hunting, especially in open country and mountainous terrain where long-range shots are common. It excels in taking down deer, elk, antelope, and even moose with authority. Due to its flat trajectory and high retained energy, it is also favored by precision shooters who demand consistent performance at extended ranges.

Caliber/Size

This cartridge fires a 7mm (.284 inch) diameter bullet, typically ranging in weight from 139 to 175 grains. It features a belted, bottleneck case derived from the 8mm Remington Magnum, giving it a large powder capacity for superior velocity and energy. The overall cartridge length fits standard long-action rifles.

Performance Characteristics

One of the fastest commercial 7mm cartridges, the 7mm STW delivers muzzle velocities ranging from 3,200 to 3,400 feet per second, depending on bullet weight and load. Its ballistic performance is exceptional, with high ballistic coefficient (BC) bullets offering minimal wind drift and significant retained energy at long distances. Recoil is stout, but manageable with proper stock design and recoil mitigation.

Material / Construction

7mm STW ammunition is typically built with premium brass cases and high-performance projectiles. Common bullet types include polymer-tipped, boat-tail hollow points (BTHP), soft points (SP), and bonded-core bullets. These are designed for optimal long-range accuracy and reliable terminal performance on large game. Reloaders favor this round due to its versatility with various powder and bullet combinations.

Brands and Manufacturers

While not as common as some mainstream calibers, 7mm STW is available from premium ammunition manufacturers such as Nosler, Federal Premium, and Remington. Handloaders often rely on brass and components from companies like Nosler and Hornady to craft custom loads tailored to their specific rifles and needs.

Brief History of the Caliber

The 7mm STW was developed in the early 1980s by Layne Simpson, a writer for Shooting Times magazine. It was later standardized by Remington in 1997, gaining SAAMI approval. The cartridge quickly earned a following among long-range hunters and precision shooters for its remarkable velocity and downrange performance. Though not as mainstream as the 7mm Rem Mag or .300 Win Mag, it remains a cult favorite among serious Western hunters and ballistic enthusiasts.

FAQ

• What is the effective range of 7mm STW ammunition?
  With proper optics and a skilled shooter, the 7mm STW is effective out to 800–1,000 yards or more, making it ideal for long-range hunting and target shooting.
• Is the 7mm STW suitable for elk and moose?
  Yes, the 7mm STW offers more than enough velocity and energy for ethically harvesting large game like elk and moose, especially with premium bullets.
• How does 7mm STW compare to 7mm Remington Magnum?
  The 7mm STW delivers higher velocity and flatter trajectory than the 7mm Rem Mag, but also comes with increased recoil and barrel wear.
• Is factory ammo readily available for 7mm STW?
  It’s less common than more mainstream cartridges, but factory loads from brands like Nosler and Remington are available, especially through online retailers.
• Can I reload 7mm STW ammunition?
  Absolutely. The 7mm STW is a favorite among handloaders who want to maximize accuracy and performance with customized loads.