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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
R700 SA build... 7SAUM?
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<blockquote data-quote="TheDerkster" data-source="post: 1261385" data-attributes="member: 92447"><p>So basically the 7SS is a 7mm SAUM based cartridge that has 40° shoulders (I think that's the number) and has the neck pushed back slightly so that you can still magfeed the ultra long bullets. I can still mag feed 195 EOL is that tells you anything in a M10 savage.</p><p></p><p>The longer neck also should give more rounds because your keeping the flame longer whereas cases like the 7mm WSM have a short neck and the flame hits the throat (flame as in plasma, at least accoring to some people). So containment of the blast within the case should increase throat life.</p><p></p><p>I'm nor sure what you can expect with a 7mm SAUM, but you can expect some unreal velocities for the powder charge. For example, the 300 Sherman Shortmag was pushing 215 Bergers at 3000 fps by some guys on the forum but that's a little hot I think. That's also with only 65 or 66 gr of powder. Don't quote me on that though, I can't remember exact numbers <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>My gun shoots 195 eol with 59 grain of RL26 at around 2930 fps or so. That's a good load as well and I can't shoot as good as the gun can group. Itll hold half MOA easy out to at least 300 yards which is all I've had time to mess with. I'd say I could hit 3000 if I maxed the load out. </p><p></p><p>The dies are superb...they come from whidden gun works wit micrometer seating die. They aren't cheap, but worth it. And they will take care of any problems you have if you happen to have one somehow great people. Other things you will need is a case length trimmer and a neck trimmer. That's it.</p></blockquote><p></p>
[QUOTE="TheDerkster, post: 1261385, member: 92447"] So basically the 7SS is a 7mm SAUM based cartridge that has 40° shoulders (I think that's the number) and has the neck pushed back slightly so that you can still magfeed the ultra long bullets. I can still mag feed 195 EOL is that tells you anything in a M10 savage. The longer neck also should give more rounds because your keeping the flame longer whereas cases like the 7mm WSM have a short neck and the flame hits the throat (flame as in plasma, at least accoring to some people). So containment of the blast within the case should increase throat life. I'm nor sure what you can expect with a 7mm SAUM, but you can expect some unreal velocities for the powder charge. For example, the 300 Sherman Shortmag was pushing 215 Bergers at 3000 fps by some guys on the forum but that's a little hot I think. That's also with only 65 or 66 gr of powder. Don't quote me on that though, I can't remember exact numbers :) My gun shoots 195 eol with 59 grain of RL26 at around 2930 fps or so. That's a good load as well and I can't shoot as good as the gun can group. Itll hold half MOA easy out to at least 300 yards which is all I've had time to mess with. I'd say I could hit 3000 if I maxed the load out. The dies are superb...they come from whidden gun works wit micrometer seating die. They aren't cheap, but worth it. And they will take care of any problems you have if you happen to have one somehow great people. Other things you will need is a case length trimmer and a neck trimmer. That's it. [/QUOTE]
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R700 SA build... 7SAUM?
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