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Rifles, Reloading, Optics, Equipment
Reloading
runout created by bullet seating
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<blockquote data-quote="clownbuster" data-source="post: 1637404" data-attributes="member: 22486"><p>Ok, so there is "runout" and "total indicated runout"... Which number are you providing? If your seeing .005" total indicated runout than your actual runout is .0025" (One half your TIR). A lot of people get this messed up. You have to cut your TIR number in half to get your actual runout number.... Now, with that said, TIR is still a good measurement of round to round concentricity... But, your setup isnt putting out .005" runout either. Its putting out a max of .0025" and something in your process is causing this. Anything under .005" runout is actual just fine. Sure, we all want the .001 runout number but anything under .005" is good to go.</p><p></p><p>My setup. Forster Co-Ax, Forster FL sizing die honed to size neck .004" under final sized neck diameter with expander removed. I set final neck tension with a 21st Century TiN turning mandrel for a final neck diameter of .002" neck tension. My runout is consistently in the 0.0005"-0.0015" TIR range meaning my actual runout is half those numbers. I also anneal every 3rd firing on Lapua brass.</p><p></p><p></p><p>So, a few questions...</p><p></p><p>1) Did you ream the brass as a last step just before seating? If yes, did you again measure your run out prior to seating? Brass is soft and "springy", even softer when its thin, and susceptible to deformation. Dont expect your brass to hold uniformity directly after reaming the mouth out. It will likely be better on your next sizing.</p><p>2) Are you annealing? If so, how often?</p><p>3) How many firings on that brass?</p><p>4) Have you sized a case with your sizing die then measured the runout on the neck? Take the average of 5 cases. What is your actual runout? (Half your TIR)</p><p>5) Measure runout right at the ogive of the bullet where it contacts the lands. Whats your actual runout there?</p><p></p><p>I am pretty positive you will find your cause following the above steps but honestly your setup is producing pretty straight ammo already. If you told me your actual runout was .009" and not your TIR than I would be concerned. I suspect your giving us your TIR.....</p></blockquote><p></p>
[QUOTE="clownbuster, post: 1637404, member: 22486"] Ok, so there is "runout" and "total indicated runout"... Which number are you providing? If your seeing .005" total indicated runout than your actual runout is .0025" (One half your TIR). A lot of people get this messed up. You have to cut your TIR number in half to get your actual runout number.... Now, with that said, TIR is still a good measurement of round to round concentricity... But, your setup isnt putting out .005" runout either. Its putting out a max of .0025" and something in your process is causing this. Anything under .005" runout is actual just fine. Sure, we all want the .001 runout number but anything under .005" is good to go. My setup. Forster Co-Ax, Forster FL sizing die honed to size neck .004" under final sized neck diameter with expander removed. I set final neck tension with a 21st Century TiN turning mandrel for a final neck diameter of .002" neck tension. My runout is consistently in the 0.0005"-0.0015" TIR range meaning my actual runout is half those numbers. I also anneal every 3rd firing on Lapua brass. So, a few questions... 1) Did you ream the brass as a last step just before seating? If yes, did you again measure your run out prior to seating? Brass is soft and "springy", even softer when its thin, and susceptible to deformation. Dont expect your brass to hold uniformity directly after reaming the mouth out. It will likely be better on your next sizing. 2) Are you annealing? If so, how often? 3) How many firings on that brass? 4) Have you sized a case with your sizing die then measured the runout on the neck? Take the average of 5 cases. What is your actual runout? (Half your TIR) 5) Measure runout right at the ogive of the bullet where it contacts the lands. Whats your actual runout there? I am pretty positive you will find your cause following the above steps but honestly your setup is producing pretty straight ammo already. If you told me your actual runout was .009" and not your TIR than I would be concerned. I suspect your giving us your TIR..... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
runout created by bullet seating
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