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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need educated. Pressure, FPS, and seating depth
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<blockquote data-quote="BMF" data-source="post: 864101" data-attributes="member: 12201"><p>In my 6.5x284, I lost about 15-25 fps every .015 I loaded away from the lands. It looks like your velocity is acting like it should. And certainly when you go with the hotter primers your velocity is going to increase. But regardless of your extractor marks on your brass, if you're using the same powder and primers and your velocity goes up or down due to seating depth, so does your pressure. They will be related. </p><p></p><p>Pressure signs are a tricky thing, especially with Slow burning powders like retumbo. I've found that with Retumbo I was getting the "occasional flyer". When I say flyer, I mean on my chrono and paper. Even though I wasn't near the max load, sometimes I would get an unusually high or LOW ( which is odd) chrono reading. </p><p></p><p>If your seeing ejector marks, especially on Lapua brass, that's the first sign ( not a good gauge though) of pressure. It's not necessarily a red flag point, but......you know. From there just monitor your velocity, which is a good gauge of pressure. Do at least 4 shot strings. Your ES will will start to spread when pressure is elevated.</p><p>Brent</p></blockquote><p></p>
[QUOTE="BMF, post: 864101, member: 12201"] In my 6.5x284, I lost about 15-25 fps every .015 I loaded away from the lands. It looks like your velocity is acting like it should. And certainly when you go with the hotter primers your velocity is going to increase. But regardless of your extractor marks on your brass, if you're using the same powder and primers and your velocity goes up or down due to seating depth, so does your pressure. They will be related. Pressure signs are a tricky thing, especially with Slow burning powders like retumbo. I've found that with Retumbo I was getting the "occasional flyer". When I say flyer, I mean on my chrono and paper. Even though I wasn't near the max load, sometimes I would get an unusually high or LOW ( which is odd) chrono reading. If your seeing ejector marks, especially on Lapua brass, that's the first sign ( not a good gauge though) of pressure. It's not necessarily a red flag point, but......you know. From there just monitor your velocity, which is a good gauge of pressure. Do at least 4 shot strings. Your ES will will start to spread when pressure is elevated. Brent [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need educated. Pressure, FPS, and seating depth
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