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Rifles, Reloading, Optics, Equipment
Reloading
Determining Precision COALs
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<blockquote data-quote="QuietTexan" data-source="post: 2197309" data-attributes="member: 116181"><p>I've been vocal enough about this in the past that so don't want to climb back up on my soapbox for the whole screed, but I still feel two things are relevant: first, using the fire-formed or generic case doesn't really matter because the headspace difference between the two should be pretty well fixed. Use a headspace comparator (or LE Wilson case gage mic) to figure the difference between the two, and that's the difference in that gun. If you're pushing forward with the Hornady tool the case it's tight against the shoulder in the chamber so what you're trying to measure is the headspace difference between the rear of the case and the bolt face, which should be fixed between a SAAMI minimum case like the modified case and a fired case for that rifle/chamber/bolt. We're probably only talking a couple thousandths here anyways, if the modified case is 0.002" shorter than a fired case, just add that to BTO when you seat. Now if you can't get a modified case by all means use a fired case and save the step, it's just not a problem to NOT use a fired case.</p><p></p><p>Second is that I don't buy into any method of finding the lands that isn't repeatable. Use whatever method you want, but if you aren't getting consistent and repeatable measurements you're pretty much just wasting time. Wheeler, Hornady, Stony Point, sharpie, carved unicorn horn, use whatever method you want but get to the point you get repeatable results with it. I've found that for me I get the most repeatable results with a hard jam in the Hornady tool, not some kind of ethereal "kissing the lands" or tapping the rod or whatnot. I look for less than 0.001" variance in my measurements, and back out from there. </p><p></p><p>Agree 100% with secant ogive bullets being highly jump tolerant. ABLRs specifically Nosler put a note on their website saying in so many words "stop trying to jam these things, seat them at SAAMI COL before you send us any more hate mail".</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2197309, member: 116181"] I've been vocal enough about this in the past that so don't want to climb back up on my soapbox for the whole screed, but I still feel two things are relevant: first, using the fire-formed or generic case doesn't really matter because the headspace difference between the two should be pretty well fixed. Use a headspace comparator (or LE Wilson case gage mic) to figure the difference between the two, and that's the difference in that gun. If you're pushing forward with the Hornady tool the case it's tight against the shoulder in the chamber so what you're trying to measure is the headspace difference between the rear of the case and the bolt face, which should be fixed between a SAAMI minimum case like the modified case and a fired case for that rifle/chamber/bolt. We're probably only talking a couple thousandths here anyways, if the modified case is 0.002" shorter than a fired case, just add that to BTO when you seat. Now if you can't get a modified case by all means use a fired case and save the step, it's just not a problem to NOT use a fired case. Second is that I don't buy into any method of finding the lands that isn't repeatable. Use whatever method you want, but if you aren't getting consistent and repeatable measurements you're pretty much just wasting time. Wheeler, Hornady, Stony Point, sharpie, carved unicorn horn, use whatever method you want but get to the point you get repeatable results with it. I've found that for me I get the most repeatable results with a hard jam in the Hornady tool, not some kind of ethereal "kissing the lands" or tapping the rod or whatnot. I look for less than 0.001" variance in my measurements, and back out from there. Agree 100% with secant ogive bullets being highly jump tolerant. ABLRs specifically Nosler put a note on their website saying in so many words "stop trying to jam these things, seat them at SAAMI COL before you send us any more hate mail". [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Determining Precision COALs
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