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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 mm SHERMAN SHORTMAG vs 7 SAUM
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<blockquote data-quote="elkaholic" data-source="post: 1516637" data-attributes="member: 13833"><p>People often ask what pressure we're running and the truth is, I don't know! The question I get a lot is "how can you shorten a parent case and make it shoot faster"? Glad you asked! , </p><p>(1)There is no loss of capacity in the SS case vs the saum. Even though it is considerably shorter, with the taper blown out and the shoulder sharpened, the capacity is nearly identical. (2)Because it is far shorter, the bullet can be seated out into the neck so that useable capacity is MORE that the Saum. (3) the shorter burning column and 40 degree shoulder make the SS more efficient getting more out of the charge. (4) with low body taper, the pressure is distributed better throughout the chamber (less bolt thrust) this allows higher operating pressure without destroying brass. SS shooters will vouch that brass lasts longer at higher velocities than the Saum will reach </p><p>All these things are exactly why the SS was developed. To be the best performing cartridge available under 3" coal. You can get close to SS velocity with a saum, but you have to have a 3.1" coal to do it, and even then, you will likely come up a little short. I'm sure there are people who load hot, as with any cartridge, but the 7ss isn't running 3000' with a 180 vld by running dangerous pressure when the brass is lasting double digit loading! The skeptics should try it and see for themselves!</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1516637, member: 13833"] People often ask what pressure we're running and the truth is, I don't know! The question I get a lot is "how can you shorten a parent case and make it shoot faster"? Glad you asked! , (1)There is no loss of capacity in the SS case vs the saum. Even though it is considerably shorter, with the taper blown out and the shoulder sharpened, the capacity is nearly identical. (2)Because it is far shorter, the bullet can be seated out into the neck so that useable capacity is MORE that the Saum. (3) the shorter burning column and 40 degree shoulder make the SS more efficient getting more out of the charge. (4) with low body taper, the pressure is distributed better throughout the chamber (less bolt thrust) this allows higher operating pressure without destroying brass. SS shooters will vouch that brass lasts longer at higher velocities than the Saum will reach All these things are exactly why the SS was developed. To be the best performing cartridge available under 3" coal. You can get close to SS velocity with a saum, but you have to have a 3.1" coal to do it, and even then, you will likely come up a little short. I'm sure there are people who load hot, as with any cartridge, but the 7ss isn't running 3000' with a 180 vld by running dangerous pressure when the brass is lasting double digit loading! The skeptics should try it and see for themselves! [/QUOTE]
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7 mm SHERMAN SHORTMAG vs 7 SAUM
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