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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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<blockquote data-quote=".280Rem" data-source="post: 206703" data-attributes="member: 11140"><p>I will further address my "velocity indicates pressure" by saying that if my starting load above of 54grs showed a velocity of 3000fps, then I would not say "Hey I got a fast gun" and continue to work up to the "book max powder charge" because the book says that's a safe max load. I would have in fact started at <strong>my gun's max load</strong>, though inadvertently. </p><p> </p><p>Also, I have read some things on primers and their effect on pressure/velocity. The consensus seems to be there is nothing that is scientifically predictable about it. The effect primer change can have is dependant on many other factors such as load density, powder burn rate, case capacity, bullet wt. etc. Now in any particular application you might could find a trend with regard to primer's effect on velocity/pressure, but the rules will be different for a .44mag using Unique with cast bullets, and a .300WinMag with R-22 and 180gr Copper jacketed bullets. A hotter primer giving less velocity with higher pressure, and a "cooler" primer giving more velocity and less pressure, and vice versa to both have all been observed. </p><p> </p><p>overbore, </p><p> </p><p>I would love to read what you said you wrote about primers. Is it online? Or where can I find it?</p></blockquote><p></p>
[QUOTE=".280Rem, post: 206703, member: 11140"] I will further address my "velocity indicates pressure" by saying that if my starting load above of 54grs showed a velocity of 3000fps, then I would not say "Hey I got a fast gun" and continue to work up to the "book max powder charge" because the book says that's a safe max load. I would have in fact started at [B]my gun's max load[/B], though inadvertently. Also, I have read some things on primers and their effect on pressure/velocity. The consensus seems to be there is nothing that is scientifically predictable about it. The effect primer change can have is dependant on many other factors such as load density, powder burn rate, case capacity, bullet wt. etc. Now in any particular application you might could find a trend with regard to primer's effect on velocity/pressure, but the rules will be different for a .44mag using Unique with cast bullets, and a .300WinMag with R-22 and 180gr Copper jacketed bullets. A hotter primer giving less velocity with higher pressure, and a "cooler" primer giving more velocity and less pressure, and vice versa to both have all been observed. overbore, I would love to read what you said you wrote about primers. Is it online? Or where can I find it? [/QUOTE]
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