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Rifles, Reloading, Optics, Equipment
Gunsmithing
7rum....thinking of changing...
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<blockquote data-quote="Theotherdave" data-source="post: 1470185" data-attributes="member: 106727"><p>There's a lot of bad info in this thread on the 7mm RUM. It's not a very easy cartridge to figure out and it does not come from the factory with the proper barrel length or twist rate. </p><p></p><p>Remington screwed this cartridge up big time. </p><p></p><p>The 7mm RUM is great cartridge, IF you know what you're doing. You just need a 30" barrel to burn all that powder.</p><p></p><p>Twist has to be faster than 1-9, but you need to seriously think about going any faster than 1-8.5. At this point you will have to build a rifle around a bullet, and the bullet may not work or still be in production by the time you get the rifle. Ask me how I know this. That's a very narrow window on twist rate. </p><p></p><p>However you will be limited to either solids or bonded bullets.</p><p></p><p>On the plus side there is an insanely flat trajectory. Some bullet and powder combinations can take bullets to 1,000 yards with less than 4.5 MILs of elevation correction. </p><p></p><p>140gr. = 3,700 - 3,800 FPS</p><p></p><p>150gr. = 3,700 FPS </p><p></p><p>160gr. = 3,600+ FPS</p><p></p><p>180gr. bullets = 3,400+ FPS </p><p></p><p>190gr. = 3,300+ FPS</p><p></p><p>The muzzle energy is equal in some cases to factory .338 Lapua.</p><p></p><p>It's not for the novice, and it runs best right at the maximum pressures. Oh yes, and a muzzle brake is mandatory.</p></blockquote><p></p>
[QUOTE="Theotherdave, post: 1470185, member: 106727"] There's a lot of bad info in this thread on the 7mm RUM. It's not a very easy cartridge to figure out and it does not come from the factory with the proper barrel length or twist rate. Remington screwed this cartridge up big time. The 7mm RUM is great cartridge, IF you know what you're doing. You just need a 30" barrel to burn all that powder. Twist has to be faster than 1-9, but you need to seriously think about going any faster than 1-8.5. At this point you will have to build a rifle around a bullet, and the bullet may not work or still be in production by the time you get the rifle. Ask me how I know this. That's a very narrow window on twist rate. However you will be limited to either solids or bonded bullets. On the plus side there is an insanely flat trajectory. Some bullet and powder combinations can take bullets to 1,000 yards with less than 4.5 MILs of elevation correction. 140gr. = 3,700 - 3,800 FPS 150gr. = 3,700 FPS 160gr. = 3,600+ FPS 180gr. bullets = 3,400+ FPS 190gr. = 3,300+ FPS The muzzle energy is equal in some cases to factory .338 Lapua. It's not for the novice, and it runs best right at the maximum pressures. Oh yes, and a muzzle brake is mandatory. [/QUOTE]
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7rum....thinking of changing...
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