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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
twist for saum
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<blockquote data-quote="LouBoyd" data-source="post: 519030" data-attributes="member: 9253"><p>So far no one has mentiond the environment you'll be shooting in. Air density matters in determining the necessary barrel twist. I live at a mile elevation in Arizona where a 9" twist barrel is fine for 180 Bergers. However if you plan on shooting in sub-zero tempeeratures near sea level an 8" twist would be my recommendation. </p><p></p><p>In my opinion you need at least a 3.1" magazine for the 7mm SAUM / 180 Berger combination so the bullet shank won't extend inside the case shoulder. The SAAMI cartridge length of the 7mm SAUM is only 2.825" and most short actions don't have close to 3.1" room even with an extended magazine like a Wyatts. I'd use a medium length magnum action (3.34" magazine) if I were building the rifle you've described. You didn't mention what action you plan to use.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 519030, member: 9253"] So far no one has mentiond the environment you'll be shooting in. Air density matters in determining the necessary barrel twist. I live at a mile elevation in Arizona where a 9" twist barrel is fine for 180 Bergers. However if you plan on shooting in sub-zero tempeeratures near sea level an 8" twist would be my recommendation. In my opinion you need at least a 3.1" magazine for the 7mm SAUM / 180 Berger combination so the bullet shank won't extend inside the case shoulder. The SAAMI cartridge length of the 7mm SAUM is only 2.825" and most short actions don't have close to 3.1" room even with an extended magazine like a Wyatts. I'd use a medium length magnum action (3.34" magazine) if I were building the rifle you've described. You didn't mention what action you plan to use. [/QUOTE]
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twist for saum
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