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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]
The 7mm Shooting Times Westerner, sometimes referred to as the 7mm STW, began as a wildcat rifle cartridge developed by Layne Simpson, Field Editor of Shooting Times, in 1979.[3] It is an 8mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets.[4]
^Max chamber pressure - saami specs. Return to the index to LASC. (n.d.). Retrieved May 1, 2023, from http://www.lasc.us/SAAMIMaxPressure.htm
^"7 mm STW data" from Accurate Powder
^"7mm STW". www.chuckhawks.com.
^"7mm Shooting Times Westerner". www.ballisticstudies.com.
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