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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: 775429" data-attributes="member: 2736"><p>+1</p><p></p><p>Years ago I built a rifle in 7 STW for velocity. It had a 31" barrel with a 1 in 10 twist.</p><p></p><p>I used the 140 grain bullets because at the time A Squair had a load that was advertised at 3550</p><p>ft/sec.(They later cooled it down to 3500 ft/sec).</p><p></p><p>I reached 3800 ft/sec but accuracy went to hell with anything over 3650 ft/sec. I did some very </p><p>close test on paper (10 yrds) because I suspected bullet problems, and found out that the bullets</p><p>were coming apart at somewhere around 3650 ft/sec (Shedding the jackets).</p><p></p><p>I tried the monolithic bullets and they gave problems at these velocities also so I decided to back </p><p>off and settled for 3600 ft/sec and was very pleased with accuracy and performance with the two </p><p>bullets I used (140gr partitions at 4 to 500 yards and in and the ballistic tip for shots over 500 yards).</p><p></p><p>I had to use a drop tub for the powder I used to keep from breaking the grains due to compressed</p><p>charges of very slow powder. (H 5010).</p><p></p><p>With less twist you might reach 3800 ft/sec with the right setup but it is doubtful. I recommend a </p><p>1 in 9 twist for the STW and it works well with any bullet up to 3550 ft/sec.</p><p></p><p>Velocity is like gas mileage, some like to exaggerate. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 775429, member: 2736"] +1 Years ago I built a rifle in 7 STW for velocity. It had a 31" barrel with a 1 in 10 twist. I used the 140 grain bullets because at the time A Squair had a load that was advertised at 3550 ft/sec.(They later cooled it down to 3500 ft/sec). I reached 3800 ft/sec but accuracy went to hell with anything over 3650 ft/sec. I did some very close test on paper (10 yrds) because I suspected bullet problems, and found out that the bullets were coming apart at somewhere around 3650 ft/sec (Shedding the jackets). I tried the monolithic bullets and they gave problems at these velocities also so I decided to back off and settled for 3600 ft/sec and was very pleased with accuracy and performance with the two bullets I used (140gr partitions at 4 to 500 yards and in and the ballistic tip for shots over 500 yards). I had to use a drop tub for the powder I used to keep from breaking the grains due to compressed charges of very slow powder. (H 5010). With less twist you might reach 3800 ft/sec with the right setup but it is doubtful. I recommend a 1 in 9 twist for the STW and it works well with any bullet up to 3550 ft/sec. Velocity is like gas mileage, some like to exaggerate. J E CUSTOM [/QUOTE]
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4000 fps in a 7mm STW w/140 Bullet?
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