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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 saum vs. 6.5 wsm
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<blockquote data-quote="elkaholic" data-source="post: 1385524" data-attributes="member: 13833"><p>The ss has a shorter burn column than the Saum because the shoulder is back considerably. There is no capacity lost because of less body taper and the 40 degree shoulder. The design of the case allows for the bullet to be seated (out of the case body) to the base of the neck </p><p>which gives more USEABLE capacity than the Saum. This more compact design keeps the coal much shorter so it will function in a short action. i.e. shorter burn column means more efficiency coupled with more useable capacity equaling more velocity at equal pressure! In addition, the low body taper and 40 degree shoulder create more radial pressure and less bolt thrust which allows the cartridge to operate at higher pressure than normal Saum brass. The velocities between the two have been proven by Smith's building both cartridges while using the same brass. The ss also has less case stretching because of lower body taper and sharper shoulder angle equaling less trimming and better brass life. The sharper shoulder coupled with a longer neck than the Saum means the hottest flame point of the burned gases Is better contained inside the neck rather than directly into the throat. This is why a 6.5/284 gets less barrel life by far and yet falls at least 200' short in velocity. The ONLY downside to the ss WAS brass but I currently have prepped brass ready to load (form) and head stamped brass of Lapua quality will be available this summer! You can get CLOSE to ss velocity if you throat a Saum and single feed or go with a much longer mag,; but why? The Saum is a good cartridge; make no mistake, but the ss is better! As a matter of fact, if you just want to equal the Saum and do it with a 2.770 coal with a 147 eldm, just build the sst which will also have brass. I run the 147 in mine for hunting at 3107'....rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1385524, member: 13833"] The ss has a shorter burn column than the Saum because the shoulder is back considerably. There is no capacity lost because of less body taper and the 40 degree shoulder. The design of the case allows for the bullet to be seated (out of the case body) to the base of the neck which gives more USEABLE capacity than the Saum. This more compact design keeps the coal much shorter so it will function in a short action. i.e. shorter burn column means more efficiency coupled with more useable capacity equaling more velocity at equal pressure! In addition, the low body taper and 40 degree shoulder create more radial pressure and less bolt thrust which allows the cartridge to operate at higher pressure than normal Saum brass. The velocities between the two have been proven by Smith's building both cartridges while using the same brass. The ss also has less case stretching because of lower body taper and sharper shoulder angle equaling less trimming and better brass life. The sharper shoulder coupled with a longer neck than the Saum means the hottest flame point of the burned gases Is better contained inside the neck rather than directly into the throat. This is why a 6.5/284 gets less barrel life by far and yet falls at least 200' short in velocity. The ONLY downside to the ss WAS brass but I currently have prepped brass ready to load (form) and head stamped brass of Lapua quality will be available this summer! You can get CLOSE to ss velocity if you throat a Saum and single feed or go with a much longer mag,; but why? The Saum is a good cartridge; make no mistake, but the ss is better! As a matter of fact, if you just want to equal the Saum and do it with a 2.770 coal with a 147 eldm, just build the sst which will also have brass. I run the 147 in mine for hunting at 3107'....rich [/QUOTE]
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6.5 saum vs. 6.5 wsm
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