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Rifles, Reloading, Optics, Equipment
Reloading
4000 fps in a 7mm STW w/140 Bullet?
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<blockquote data-quote="J E Custom" data-source="post: 1349069" data-attributes="member: 2736"><p>This is a very old post but the question keeps coming up so I will share</p><p>my experience with the 7 STW.</p><p></p><p>Like many people, I had a purpose built 7 STW before any ammo was available and you loaded using the 8mm Remington cases.</p><p></p><p>The rifle was a single shot 1885 High wall with a 31" barrel to see what velocities were possible with the "New" cartridge.</p><p></p><p>Using the 140 grain bullet to be able to compare it to the 7 rem mag I quickly found the weakness in the system. It was the bullets. later A Square loaded a 140 grain load to an advertised 3500 but in my 31" barrel it would just barely achieve it and later they dropped it to 3450</p><p>ft/sec.</p><p></p><p>I did reach 3800 ft/sec but the bullets started to shed the jackets and accuracy went out the window beyond 3700 ft/sec. I then tried monolithic solids and they were worse in the accuracy department and</p><p>would not perform very well above 3400 ft/sec.</p><p></p><p>The other issue was pressure, and loads that pushed 140s to 3800 ft/sec lost primer pockets after 2 firings So even with better cases and</p><p>more powder selections, I doubt that anything over 3500 to 3600 ft/sec is possible with any accuracy and SAMME max pressures.</p><p></p><p>No doubt the lightest bullets could be pushed to 4000 ft/sec if you could find a bullet that would hold up at those speeds and pressures, But at what cost to the equipment and accuracy, not to mention barrel life.</p><p></p><p>The 7 STW is a great cartridge, but don't ask more of it than it is capable off.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1349069, member: 2736"] This is a very old post but the question keeps coming up so I will share my experience with the 7 STW. Like many people, I had a purpose built 7 STW before any ammo was available and you loaded using the 8mm Remington cases. The rifle was a single shot 1885 High wall with a 31" barrel to see what velocities were possible with the "New" cartridge. Using the 140 grain bullet to be able to compare it to the 7 rem mag I quickly found the weakness in the system. It was the bullets. later A Square loaded a 140 grain load to an advertised 3500 but in my 31" barrel it would just barely achieve it and later they dropped it to 3450 ft/sec. I did reach 3800 ft/sec but the bullets started to shed the jackets and accuracy went out the window beyond 3700 ft/sec. I then tried monolithic solids and they were worse in the accuracy department and would not perform very well above 3400 ft/sec. The other issue was pressure, and loads that pushed 140s to 3800 ft/sec lost primer pockets after 2 firings So even with better cases and more powder selections, I doubt that anything over 3500 to 3600 ft/sec is possible with any accuracy and SAMME max pressures. No doubt the lightest bullets could be pushed to 4000 ft/sec if you could find a bullet that would hold up at those speeds and pressures, But at what cost to the equipment and accuracy, not to mention barrel life. The 7 STW is a great cartridge, but don't ask more of it than it is capable off. J E CUSTOM [/QUOTE]
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4000 fps in a 7mm STW w/140 Bullet?
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