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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bad news on long-awaited 7RUM Shaw barrel.
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<blockquote data-quote="Lefty7mmstw" data-source="post: 675247" data-attributes="member: 48043"><p>In a standard barreled stw or rum you had better have an iron deficiency of you want to go over 3500 fps on a 140 (by any significant margin) or 3400 fps on a 150 because eventually you will eat a bolt. I have pushed the 120 sierra to 4K fps even with the 7 rum(the stw tops out around 3700 fps with a 120) by using an extremely heavy dose of AA 8700. It was almost 1 grain powder for 1 grain bullet. If you go longer than 26" your barrels will do somewhat better, but I wouldn't bet on more than 25 fps per inch. The stw is down to around 12K psi at the end of a 26" barrel, so you aren't pushing very hard anymore.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 675247, member: 48043"] In a standard barreled stw or rum you had better have an iron deficiency of you want to go over 3500 fps on a 140 (by any significant margin) or 3400 fps on a 150 because eventually you will eat a bolt. I have pushed the 120 sierra to 4K fps even with the 7 rum(the stw tops out around 3700 fps with a 120) by using an extremely heavy dose of AA 8700. It was almost 1 grain powder for 1 grain bullet. If you go longer than 26" your barrels will do somewhat better, but I wouldn't bet on more than 25 fps per inch. The stw is down to around 12K psi at the end of a 26" barrel, so you aren't pushing very hard anymore. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bad news on long-awaited 7RUM Shaw barrel.
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