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7 rum?
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<blockquote data-quote="J E Custom" data-source="post: 1781931" data-attributes="member: 2736"><p>I had misgivings about the 7 RUM in the beginning because of the 7 STWs that I had based it's performance. My STW had a 31" barrel and I found it hard to believe that It could best it in a 26 to 28" barrel. It did. The main advantage to the 7 RUM is its ability to send the big 7 mm bullets down range at a higher velocity than most other cartridges in 7 mm.</p><p></p><p>All the load data that I could find for the 7 RUM showed a test barrel length of 24" and that is only good for around 50 ft/sec more than the STW. The big 7 RUM comes into its own with 28'' or more barrel because of the powder capacity. I had to work up all of my loads carefully to get the 200+ft/sec improvement with the big bullets over the STW.</p><p></p><p>Choice of powder and barrel length are the secret to performance in the 7 RUM. I also prefer to keep my loads in the 90%+ case density so the slowest powders are required and a barrel long enough to burn it. I also believe that More freebore is needed to keep the pressures down so don't infringe on the .400 freebore that the 7 rum was designed for. If loaded correctly the accuracy and pressures are great.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1781931, member: 2736"] I had misgivings about the 7 RUM in the beginning because of the 7 STWs that I had based it's performance. My STW had a 31" barrel and I found it hard to believe that It could best it in a 26 to 28" barrel. It did. The main advantage to the 7 RUM is its ability to send the big 7 mm bullets down range at a higher velocity than most other cartridges in 7 mm. All the load data that I could find for the 7 RUM showed a test barrel length of 24" and that is only good for around 50 ft/sec more than the STW. The big 7 RUM comes into its own with 28'' or more barrel because of the powder capacity. I had to work up all of my loads carefully to get the 200+ft/sec improvement with the big bullets over the STW. Choice of powder and barrel length are the secret to performance in the 7 RUM. I also prefer to keep my loads in the 90%+ case density so the slowest powders are required and a barrel long enough to burn it. I also believe that More freebore is needed to keep the pressures down so don't infringe on the .400 freebore that the 7 rum was designed for. If loaded correctly the accuracy and pressures are great. J E CUSTOM [/QUOTE]
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