7 mm STW

Infobox Firearm Cartridge
name= 7 mm STW


caption=
origin= USA
type= Rifle
service=
used_by=
wars=
designer= Layne Simpson
design_date=1979
manufacturer=
production_date=1989-Present
number=
variants=
is_SI_specs=
parent=8 mm Remington Magnum
case_type=Belted, bottleneck
bullet=.284
neck=.315
shoulder=.4868
base=.5126
rim_dia=.532
rim_thick=.220
case_length=2.850
length=3.60
rifling=9
primer=Large rifle magnum

is_SI_ballistics=
bw1=120
btype1=X
vel1=3384
en1=3052
bw2=140
btype2=X
vel2=3268
en2=3321
bw3=150
btype3=BT
vel3=3233
en3=3482
bw4=160
btype4=Partition
vel4=3177
en4=3587
bw5=175
btype5=PSPCL
vel5=3047
en5=3609
test_barrel_length=26"
balsrc= Accurate Powder " [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/284Cal(7.21mm)/7mm%20STW%20page%20251.pdf 7 mm STW data] " from Accurate Powder] The 7 mm STW ("Shooting Times Westerner") began as a wildcat rifle cartridge developed by Layne Simpson in 1979." [http://www.chuckhawks.com/7mmSTW.htm The 7mm STW (Shooting Times Westerner)] " by Chuck Hawks] It is an 8 mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets. This cartridge is named after the magazine "Shooting Times" where Layne Simpson is a regular contributor.

Background

The 7mm STW graduated to commercial status when it was officially recognized by SAAMI in 1996." [http://www.chuckhawks.com/subscribers/rifle_cartridge_page/7mmSTW.htm The 7mm STW (Shooting Times Westerner)] " by Chuck Hawks (subscription only)]
Remington Arms Company was one of the first large ammunition companies to produce this cartridge in 1997, with others like Federal Cartridge Company, A-Square, and Speer also carrying it. All mass-market now offer a selection of production models chambered for the 7mm STW, which has established a reputation as a fine long-range deer and medium game rifle.

Performance

The only the commercial 7mm cartridge to have more power than the 7mm STW is the 7mm Remington Ultra Magnum. Dimensionally and ballistically, there are similarities between the 7mm STW and the 6mm cartridge based on the .375 H&H Magnum case necked down, known as the .244 H&H Magnum.fact|date=August 2007

ee also

*7mm calibre for other cartridges of this calibre.

References

* [http://www.rifleshootermag.com/ammunition/seven_092105/index1.html "Rifle Shooter Magazine" article on 7mm cartridges]