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7 rum
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<blockquote data-quote="J E Custom" data-source="post: 427818" data-attributes="member: 2736"><p>I purpose built a 7mm STW with a 31" barrel to reach max velocity with a 140grain bullet.</p><p>the problem was that anything over 3750 would destroy the bullet before it reached the target</p><p>so I backed down to 3650 in order to improve accuracy. (I was looking for the flattest trajectory</p><p>possible and this beast filled the bill).</p><p></p><p>After just over 1400 rounds I saw no deterioration in the accuracy but Decided to re barrel to</p><p>the 7mm RUM to see if the velocity was possible with less pressure indications and longer </p><p>brass life. it also has a 31" barrel.</p><p></p><p>So far I am above 3600 ft/sec with the 140s and no signs of pressure or brass failure.</p><p></p><p>The 160grain bullets are approaching 3500ft/sec with no signs of pressure and very good</p><p>accuracy It will probably be the bullet of choice for the RUM. Testing is not complete yet </p><p>and all of the votes are not in yet.</p><p></p><p>There is another post by Kirby that talks about barrel life and I am a believer in what he </p><p>has to say about keeping the barrel clean and not letting it get hot. This philosophy has </p><p>served me well and barrel life has not been an issue.</p><p></p><p>I even go to the trouble of pulling a bore snake through the barrel after each shot in the field</p><p>so that the next shot is through a "Clean Barrel" (It removes the powder residue and some </p><p>of the carbon that is very abrasive.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 427818, member: 2736"] I purpose built a 7mm STW with a 31" barrel to reach max velocity with a 140grain bullet. the problem was that anything over 3750 would destroy the bullet before it reached the target so I backed down to 3650 in order to improve accuracy. (I was looking for the flattest trajectory possible and this beast filled the bill). After just over 1400 rounds I saw no deterioration in the accuracy but Decided to re barrel to the 7mm RUM to see if the velocity was possible with less pressure indications and longer brass life. it also has a 31" barrel. So far I am above 3600 ft/sec with the 140s and no signs of pressure or brass failure. The 160grain bullets are approaching 3500ft/sec with no signs of pressure and very good accuracy It will probably be the bullet of choice for the RUM. Testing is not complete yet and all of the votes are not in yet. There is another post by Kirby that talks about barrel life and I am a believer in what he has to say about keeping the barrel clean and not letting it get hot. This philosophy has served me well and barrel life has not been an issue. I even go to the trouble of pulling a bore snake through the barrel after each shot in the field so that the next shot is through a "Clean Barrel" (It removes the powder residue and some of the carbon that is very abrasive. J E CUSTOM [/QUOTE]
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