Go to your saved Cartridges

Your Armory

  • Your Armory is empty.

Can't find what you're looking for? Open a ticket and we will help you find it!

7MM STW

7mm_stw

Introduced in 1979 and intended to offer superior performance, compared to the 7mm Rem Mag, the 7mm STW case was then a bit much, capacity wise.  We just did not have propellants that would allow us to take advantage of so much case capacity in the 7mm bore size.

As with any high-performance round, barrel heating is a significant concern.  Allowing plenty of time for barrel cooling can significantly increase barrel life.  Conversely, overheating the barrel by rapid firing can render a barrel uselessly inaccurate after surprisingly few shots (see the 264 Win Mag text).  For a big game hunter this might not be much of a concern (see 7mm Rem Mag text).


Even today, with the best modern propellants, it can only offer about 80-fps over what the 7mm Rem Mag can do with 175-grain bullets and practically 100% of that advantage results from higher working pressure.

When loaded at the same pressure with the same bullet and the best available propellant, performance is essentially indistinguishable.  But, of course, we cannot ignore SAAMI pressure specifications and when loaded within those, the STW does have an edge over the Rem Mag.

While 80 fps might not seem like much, velocity is always king.  Velocity is why we gave up throwing fists and graduated to rocks; then gave up rocks and graduated to spears; then gave up spears and graduated to an atlatl; then gave up the atlatl and graduated to arrows; and then gave up arrows and graduated to bullets!

As was a host of standard belted–magnum cartridges, this case was derived from the circa 1912, 375 H&H.


The text associated with the cartridge description reflects opinions and conclusions of the author, M.L. (Mic) McPherson. Lee Precision and its employees do not necessarily either agree or disagree with any of his comments. We present these with due deference to his recognized expertise in the firearms field. His acumen extends to handloading and all aspects of ballistics - internal, external, and terminal.
Die Sets
Lee Collet Necksizing 2-Die Set
Lee RGB Die Set
Lee Full-Length Sizing Die Set
90678 (3-Die set)
Lee Breech Lock Die Set
Lee Ultimate 4-Die Set
Lee Loader
Single Dies
Full-Length Sizing Die
91065
Sizing Die
Neck Sizing Die
Undersize Sizing Die
Charging Die
Seating Die
91427
Factory Crimp Die
90869 (Collet Style)
Taper Crimp Die
Inline Bullet Feed Die
Die Accessories
Guided Decapper
91578
Undersized Flash Hole Decapping Mandrel
Undersized Mandrel
Case Conditioning Tools
Case Length Gauge and Shell Holder
91332
Quick Trim Die
Presses
Reloader Press (50 RPH)
Hand Press (50 RPH)
Challenger Press (50 RPH)
Classic Cast Press (50 RPH)
Value Turret Press (250 RPH)
Classic Turret Press (250 RPH)
Ultimate Turret Press (250 RPH)
Pro 1000 Press (500+ RPH)
Pro 4000 Press (500+ RPH)
Six Pack Pro Press (500+ RPH)
Shell Plates and Holders
Priming Tool Shell Holder
90205 (#5)
Universal Press Shell Holder
90522 (R5)
X-Press Shell Holder (APP)
91538 (#5)
Pro 1000 Shell Plate
Auto Breech | Pro 4000 Shell Plate
Six Pack Pro Shell Plate
91840 (5L)
Inline Bullet Feed
Inline Bullet Feed Die
Inline Bullet Feed Kit
Inline Bullet Feed Magazine
Bullet Casting
Classic Bullet Sizing Kit
Breech Lock Bullet Sizer and Punch
Bullet Molds

Challenger III

From $117.00

Ultimate Turret Press

From $320.00

Deluxe APP Press Kit

91898

The Lee Deluxe Automatic Processing Press gives you the same priming convenience found only on expensive progressive reloading presses.

$155.00

Six Pack Pro Press

From $400.00