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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7MM - Need to make a choice
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<blockquote data-quote="MontanaRifleman" data-source="post: 837202" data-attributes="member: 11717"><p>Yeah... I would say it's irresponsible to tell someone to expect an an unusually high barrel life from an overbore cartridge like the 7 STW.</p><p></p><p>As mentioned, I burned up a 7 RM barrel in a little over a 1000 rounds. about 300 of those were factory. The rest were from various loads I worked up from 110 gr bullets to 175 gr bullets. My pet load was 160 Partitions over a charge of IMR 4831 that pushed about 3000 out of a 24" barrel. A little warm, but not extreme. When my barrel burned out I started a thread in another shooting forum asking what the life expectancy was for a 7 RM. Average responses were about 1000 - 1200 rounds. That was quite a few years ago and what I've read since then is pretty much the same.</p><p></p><p>Let me ask you a couple of questions....</p><p></p><p>What are the factors in barrel life?</p><p></p><p>Light bullets vs heavy bullets?</p><p>Fast powders vs slow powders?</p><p>Rate of fire?</p><p>Heat and Pressure, i.e., hot load vs moderate load?</p><p>Case capacity?</p><p>Shoulder angle?</p><p>Length of neck?</p><p></p><p>So lets assume the 1st four being equal, Why would a 7 STW with the same shoulder angle and neck and about 12% more case capacity as the 7 RM, get 50% more barrel life? Is there some witch doctor waving a stick with a shrunken head on it, over the STW's?</p><p></p><p>Are you saying that an STW will get more barrel life on average than a 7 RM? or even a 7-300 WM which has a little less capacity than the STW and a longer neck?</p><p></p><p>One of the earlier posters here said he was getting 300-500 rounds of barrel life out of his 7 RUMs which has about 15% more capacity and a sharper shoulder and longer neck than the STW. The STW falls right between the 7 RUM and 7 RM. The average I hear most often for the RUM is about 500, which is why I shy'd away from it. I would just love to have a 7 RUM. But when you figue about $1.30 every time you pull the trigger just for the barrel on top of bullets, brass and powder... that adds up.</p><p></p><p>A couple of more questions...</p><p></p><p>Since you are so optimistic about the 7 STW barrel life are you willing to...</p><p></p><p>Guarantee the OP that he will get 1500 of good accuracy out of an STW should he choose it?</p><p></p><p>Are you willing to back up your guarantee by paying the $600-$700 it is going to cost him for a new barrel? Not to mention the PITA to ship his rifle and down time, etc.</p><p></p><p>So either walk it back or put your $$$ where your mouth is bub...</p><p></p><p>It's easy to spend someone else's $$$ on the internet...</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 837202, member: 11717"] Yeah... I would say it's irresponsible to tell someone to expect an an unusually high barrel life from an overbore cartridge like the 7 STW. As mentioned, I burned up a 7 RM barrel in a little over a 1000 rounds. about 300 of those were factory. The rest were from various loads I worked up from 110 gr bullets to 175 gr bullets. My pet load was 160 Partitions over a charge of IMR 4831 that pushed about 3000 out of a 24" barrel. A little warm, but not extreme. When my barrel burned out I started a thread in another shooting forum asking what the life expectancy was for a 7 RM. Average responses were about 1000 - 1200 rounds. That was quite a few years ago and what I've read since then is pretty much the same. Let me ask you a couple of questions.... What are the factors in barrel life? Light bullets vs heavy bullets? Fast powders vs slow powders? Rate of fire? Heat and Pressure, i.e., hot load vs moderate load? Case capacity? Shoulder angle? Length of neck? So lets assume the 1st four being equal, Why would a 7 STW with the same shoulder angle and neck and about 12% more case capacity as the 7 RM, get 50% more barrel life? Is there some witch doctor waving a stick with a shrunken head on it, over the STW's? Are you saying that an STW will get more barrel life on average than a 7 RM? or even a 7-300 WM which has a little less capacity than the STW and a longer neck? One of the earlier posters here said he was getting 300-500 rounds of barrel life out of his 7 RUMs which has about 15% more capacity and a sharper shoulder and longer neck than the STW. The STW falls right between the 7 RUM and 7 RM. The average I hear most often for the RUM is about 500, which is why I shy'd away from it. I would just love to have a 7 RUM. But when you figue about $1.30 every time you pull the trigger just for the barrel on top of bullets, brass and powder... that adds up. A couple of more questions... Since you are so optimistic about the 7 STW barrel life are you willing to... Guarantee the OP that he will get 1500 of good accuracy out of an STW should he choose it? Are you willing to back up your guarantee by paying the $600-$700 it is going to cost him for a new barrel? Not to mention the PITA to ship his rifle and down time, etc. So either walk it back or put your $$$ where your mouth is bub... It's easy to spend someone else's $$$ on the internet... [/QUOTE]
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