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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: 1095830" data-attributes="member: 13833"><p>I am in the process of getting a 7SS together, thanks to the gunsmithing talents of a certain forum member from Dillon Mt.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> I hope to be slinging lead in the next couple of weeks at which time I should have some real world data. In the mean time, I wanted to introduce the cartridge and what I am trying to accomplish. First of all, it is simply a necked up version of the 6.5 SS which has proven to be a very good performer. </p><p>Here are a few comparisons between the 7 saum and the SS and what I feel are improvements over the saum. The SS is .075" shorter oal. It is .095" shorter at the neck shoulder junction which determines where proper bullet seating depth starts. It has a .020" longer neck than the saum. It has a 40 degree shoulder and less body taper keeping case stretching to a minimum. The shorter powder burning column is more efficient. A 168 Berger seated to the base of the neck will have a coal of 2.870" to the lands so the round will cycle through much shorter magazines without loosing case capacity. The case capacity is right at 72 grains, but the USEABLE capacity is likely slightly more than the saum unless the saum is single loaded with a longer than normal throat, therefore; coupled with the shorter burn column, I expect velocity to be slightly higher than the saum. We will see<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> I expect to be able to exceed 3100 with the 168's and 3000 with the 180's. Questions, comments, or flag throwing are welcome<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />.........Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1095830, member: 13833"] I am in the process of getting a 7SS together, thanks to the gunsmithing talents of a certain forum member from Dillon Mt.:D I hope to be slinging lead in the next couple of weeks at which time I should have some real world data. In the mean time, I wanted to introduce the cartridge and what I am trying to accomplish. First of all, it is simply a necked up version of the 6.5 SS which has proven to be a very good performer. Here are a few comparisons between the 7 saum and the SS and what I feel are improvements over the saum. The SS is .075" shorter oal. It is .095" shorter at the neck shoulder junction which determines where proper bullet seating depth starts. It has a .020" longer neck than the saum. It has a 40 degree shoulder and less body taper keeping case stretching to a minimum. The shorter powder burning column is more efficient. A 168 Berger seated to the base of the neck will have a coal of 2.870" to the lands so the round will cycle through much shorter magazines without loosing case capacity. The case capacity is right at 72 grains, but the USEABLE capacity is likely slightly more than the saum unless the saum is single loaded with a longer than normal throat, therefore; coupled with the shorter burn column, I expect velocity to be slightly higher than the saum. We will see:) I expect to be able to exceed 3100 with the 168's and 3000 with the 180's. Questions, comments, or flag throwing are welcome:D.........Rich [/QUOTE]
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7 mm SHERMAN SHORTMAG vs 7 SAUM
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