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Rifles, Reloading, Optics, Equipment
Reloading
7mm reload problems (ballistics)
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<blockquote data-quote="Shortmagman" data-source="post: 399174" data-attributes="member: 10723"><p>retiredcpo,</p><p></p><p>I do understand fear of too much pressure. I also have experienced it.One day while shooting a load in a 270 Winchester that was very safe and effective in mild weather I started noticing hard bolt lift etc and even blown primers.</p><p>The temperature in Memphis was 95+ and I had left the loaded rounds out in the sun on the shooting bench. </p><p></p><p>Now when I shoot on a hot day, I make sure that my loaded rounds are out of the sun, and also not in the cab of the truck where the sun can heat them up. If they are left out in the sun they can get as hot as 140+ degrees or more and this is sure to raise the pressure sometime to a dangerous level.</p><p></p><p>When I work up a load and I am getting near the max I work up at .5 grains at a time. If you do this carefully and make sure your rounds are kept cool you can gain more velocity and still be safe. Your velocity will also tell you when you are approaching a max load. If you are below the stated velocity in a good manual you can work up and approach that velocity.</p><p></p><p>Example: We know that it is safe to get 2900 ft/sec out of a 160 grain bullet in a 7mm Rem Mag rifle in good condition. If you are getting 2700 ft/sec you can be reasonably sure that you are below the max and therefore you can work up the powder charge.</p></blockquote><p></p>
[QUOTE="Shortmagman, post: 399174, member: 10723"] retiredcpo, I do understand fear of too much pressure. I also have experienced it.One day while shooting a load in a 270 Winchester that was very safe and effective in mild weather I started noticing hard bolt lift etc and even blown primers. The temperature in Memphis was 95+ and I had left the loaded rounds out in the sun on the shooting bench. Now when I shoot on a hot day, I make sure that my loaded rounds are out of the sun, and also not in the cab of the truck where the sun can heat them up. If they are left out in the sun they can get as hot as 140+ degrees or more and this is sure to raise the pressure sometime to a dangerous level. When I work up a load and I am getting near the max I work up at .5 grains at a time. If you do this carefully and make sure your rounds are kept cool you can gain more velocity and still be safe. Your velocity will also tell you when you are approaching a max load. If you are below the stated velocity in a good manual you can work up and approach that velocity. Example: We know that it is safe to get 2900 ft/sec out of a 160 grain bullet in a 7mm Rem Mag rifle in good condition. If you are getting 2700 ft/sec you can be reasonably sure that you are below the max and therefore you can work up the powder charge. [/QUOTE]
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7mm reload problems (ballistics)
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