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Rifles, Reloading, Optics, Equipment
Reloading
Seat/charge or charge/seat
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<blockquote data-quote="cdherman" data-source="post: 2444800" data-attributes="member: 12282"><p>I like to start as close as possible to the lands, but not jambing. So I aim for .005" off. And then look for nodes with 3 or 4 shot groups spaced up from about 6% below of max load, in .06% (determined variably based on books, quickload, word of mouth or a combination). This way, I think I am getting to max pressure with initial load development. I run the shots over Labradar. Consistency of velocity also helps to find the sweet spot. Once I have the sweet spot, THEN, I seat deeper in increments of 15 or 20 thou to see if I can improve. Since deeper seating results in lower pressure, I don't have to worry about excess pressure later in the load development process. I think of this as a "charge first" process, but I guess QuietTexan has a point that we are ALL pretty much looking at basic BTO seating depth first. <strong>But systematically varying the seating depth comes AFTER varying the charge weights.</strong></p><p></p><p>I just want to get the issue of maximum load and pressure worries over with at the beginning. Seems to me that if you chose some arbitrary charge, say 94% of book max and then varied the seating depth, you would have to worry about pressure signs as you got closer to the lands. So lets say you loaded at 70, 50, 30, and 10 thousand off the lands and determined that your gun likes 30, and then you start to up the charges, you will be looking for pressure signs twice. I hate the suspense of looking at my primers and looking for marred brass and worrying I am over pressure twice....</p><p></p><p>But this is a very valid question. I'll put it differently: Does optimal seating depth vary with charge, or does the optimal charge vary with seating depth? Which is more? I don't honestly know.</p></blockquote><p></p>
[QUOTE="cdherman, post: 2444800, member: 12282"] I like to start as close as possible to the lands, but not jambing. So I aim for .005" off. And then look for nodes with 3 or 4 shot groups spaced up from about 6% below of max load, in .06% (determined variably based on books, quickload, word of mouth or a combination). This way, I think I am getting to max pressure with initial load development. I run the shots over Labradar. Consistency of velocity also helps to find the sweet spot. Once I have the sweet spot, THEN, I seat deeper in increments of 15 or 20 thou to see if I can improve. Since deeper seating results in lower pressure, I don't have to worry about excess pressure later in the load development process. I think of this as a "charge first" process, but I guess QuietTexan has a point that we are ALL pretty much looking at basic BTO seating depth first. [B]But systematically varying the seating depth comes AFTER varying the charge weights.[/B] I just want to get the issue of maximum load and pressure worries over with at the beginning. Seems to me that if you chose some arbitrary charge, say 94% of book max and then varied the seating depth, you would have to worry about pressure signs as you got closer to the lands. So lets say you loaded at 70, 50, 30, and 10 thousand off the lands and determined that your gun likes 30, and then you start to up the charges, you will be looking for pressure signs twice. I hate the suspense of looking at my primers and looking for marred brass and worrying I am over pressure twice.... But this is a very valid question. I'll put it differently: Does optimal seating depth vary with charge, or does the optimal charge vary with seating depth? Which is more? I don't honestly know. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Seat/charge or charge/seat
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