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Rifles, Reloading, Optics, Equipment
Reloading
Establishing maximum load?
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<blockquote data-quote="Mike6158" data-source="post: 2889640" data-attributes="member: 1039"><p>Kind of along the same lines as the OP's question, I did my first round of load testing on my .20 PPC (again, it's been sitting a while) last weekend. I used the load data for a .204 Ruger and worked down from max. The .20PPC case will hold more powder and predictably the velocity was way down. So now I'm about to do a second load test. I'm not sure what the spike at 23gr (RE15) is but I suspect I loaded about a grain over the 23.</p><p>[ATTACH=full]488871[/ATTACH]</p><p></p><p>In spite of the non-linear increase in charge weight the rise in velocity was linear. I'm looking for 3,500 fps. The red line is average but that is skewed by the large velocity jump. I haven't put much effort into the calculation but, assuming I don't reach max before I get to 3,500, it seems like I could linear interpolate the velocity and charge weight and get a charge weight that should be close to 3,500 fps. Obviously I wouldn't start there. I'd go backwards 0.2 gr 10 steps and start at the bottom. Example: If 25.0gr is the 3,500fps calculated powder charge then I'd load 23.2, increment 0.2gr, and see what the LabRadar tells me, load another, shoot, check data, etc. Or I could start at 23.6 and increment 0.2. That would give me some overlap with the top part of the first load test.</p><p></p><p>I can do this test (one load at a time, bench rest style lol ) at home. I honestly don't expect to see pressure signs. If I was POSITIVE that I wouldn't see pressure signs I'd just load em up and shoot em. I'm not going to do that.</p><p></p><p>Thoughts (after you read and understand what I wrote).</p></blockquote><p></p>
[QUOTE="Mike6158, post: 2889640, member: 1039"] Kind of along the same lines as the OP's question, I did my first round of load testing on my .20 PPC (again, it's been sitting a while) last weekend. I used the load data for a .204 Ruger and worked down from max. The .20PPC case will hold more powder and predictably the velocity was way down. So now I'm about to do a second load test. I'm not sure what the spike at 23gr (RE15) is but I suspect I loaded about a grain over the 23. [ATTACH type="full" alt="20 PPC Powder Charge Test.jpg"]488871[/ATTACH] In spite of the non-linear increase in charge weight the rise in velocity was linear. I'm looking for 3,500 fps. The red line is average but that is skewed by the large velocity jump. I haven't put much effort into the calculation but, assuming I don't reach max before I get to 3,500, it seems like I could linear interpolate the velocity and charge weight and get a charge weight that should be close to 3,500 fps. Obviously I wouldn't start there. I'd go backwards 0.2 gr 10 steps and start at the bottom. Example: If 25.0gr is the 3,500fps calculated powder charge then I'd load 23.2, increment 0.2gr, and see what the LabRadar tells me, load another, shoot, check data, etc. Or I could start at 23.6 and increment 0.2. That would give me some overlap with the top part of the first load test. I can do this test (one load at a time, bench rest style lol ) at home. I honestly don't expect to see pressure signs. If I was POSITIVE that I wouldn't see pressure signs I'd just load em up and shoot em. I'm not going to do that. Thoughts (after you read and understand what I wrote). [/QUOTE]
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Establishing maximum load?
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