The topic of this articlemay not meet Wikipedia'snotability guidelines for products and services. Please help to demonstrate the notability of the topic by citingreliable secondary sources that areindependent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to bemerged,redirected, ordeleted. Find sources: "7mm Shooting Times Westerner" – news ·newspapers ·books ·scholar ·JSTOR(January 2023) (Learn how and when to remove this message)

7mm Shooting Times Westerner
From left:.308 Winchester,7mm Remington Magnum,7mm Shooting Times Westerner
Type	Rifle
Place of origin	United States
Production history
Designer	Layne Simpson
Designed	1979
Produced	1989-Present
Specifications
Parent case	8mm Remington Magnum
Case type	Belted, bottleneck
Bullet diameter	.284 in (7.2 mm)
Neck diameter	.315 in (8.0 mm)
Shoulder diameter	.4868 in (12.36 mm)
Base diameter	.5126 in (13.02 mm)
Rim diameter	.532 in (13.5 mm)
Rim thickness	.220 in (5.6 mm)
Case length	2.850 in (72.4 mm)
Overall length	3.60 in (91 mm)
Case capacity	93.3 gr of H2O
Rifling twist	1 in 9 in (229 mm)
Primer type	Large rifle magnum
Maximum pressure (SAAMI[1])	65,000 psi (450 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 120 gr (8 g) X 3,384 ft/s (1,031 m/s) 3,052 ft⋅lbf (4,138 J) 140 gr (9 g) X 3,268 ft/s (996 m/s) 3,321 ft⋅lbf (4,503 J) 150 gr (10 g) BT 3,233 ft/s (985 m/s) 3,482 ft⋅lbf (4,721 J) 160 gr (10 g) Partition 3,177 ft/s (968 m/s) 3,587 ft⋅lbf (4,863 J) 175 gr (11 g) PSPCL 3,047 ft/s (929 m/s) 3,609 ft⋅lbf (4,893 J)
Test barrel length: 26" Source(s): Accurate Powder[2]

The7mm Shooting Times Westerner, sometimes referred to as the7mm STW, began as awildcat rifle cartridge developed by Layne Simpson, Field Editor of Shooting Times, in 1979.^[3] It is an8mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept7 mm (.284 in) bullets.^[4]

The first major company to produce the 7mm STW wasA-Square in 1994.^[5] The 7mm STW graduated to commercial status when it was officially recognized bySAAMI in 1996,^[6] and theRemington Arms Company started to produce it in 1997,^[7] with other ammunition manufacturers following. As of 2019,Federal Premium Ammunition is the only major manufacturer to still offer it on a regular basis, but smaller manufacturers also provide loaded ammunition.^[8]

• 7mm caliber for other cartridges of this caliber.
• Table of handgun and rifle cartridges

• Pistol and rifle cartridges
• Magnum rifle cartridges
• Wildcat cartridges

• Pages containing links to subscription-only content
• Articles with short description
• Short description matches Wikidata
• Articles with topics of unclear notability from January 2023
• All articles with topics of unclear notability
• Products articles with topics of unclear notability