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Rifles, Reloading, Optics, Equipment
Reloading
Hornady headspace comparator?
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<blockquote data-quote="birdiemc" data-source="post: 1564651" data-attributes="member: 29632"><p>Let's see if I got this right. Hornady says 308 win headspace comparator is .400". SAMMI spec shows datum for 308 win is .400". So it seems they are trying to measure to datum...if tolerances are perfect at Hornady, And in the chamber, and on the brass then it works....so in the real world it would seem the fact that it is a "comparator" is the only thing that provides value to the tool? </p><p>So apply that to measuring bump for shoulders....many say use hornady headspace comparator. I am cheap. I have the bullet comparator set, there's bushings in there big enough to fit over the shoulder on my cases so I use them. So what if they arent .400 (odds are neither is the headspace comparator, precisely) flashback to geometry tells me that as long as the angle is the same from case to case, the measurement will work to compare the two, right? And if the angle varied, the bullet comparator would provide no more error than the headspace comparator right? </p><p>Or have I just got this all wrong?</p></blockquote><p></p>
[QUOTE="birdiemc, post: 1564651, member: 29632"] Let's see if I got this right. Hornady says 308 win headspace comparator is .400". SAMMI spec shows datum for 308 win is .400". So it seems they are trying to measure to datum...if tolerances are perfect at Hornady, And in the chamber, and on the brass then it works....so in the real world it would seem the fact that it is a "comparator" is the only thing that provides value to the tool? So apply that to measuring bump for shoulders....many say use hornady headspace comparator. I am cheap. I have the bullet comparator set, there's bushings in there big enough to fit over the shoulder on my cases so I use them. So what if they arent .400 (odds are neither is the headspace comparator, precisely) flashback to geometry tells me that as long as the angle is the same from case to case, the measurement will work to compare the two, right? And if the angle varied, the bullet comparator would provide no more error than the headspace comparator right? Or have I just got this all wrong? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Hornady headspace comparator?
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