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Rifles, Reloading, Optics, Equipment
Reloading
How do you eliminate runout
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<blockquote data-quote="nksmfamjp" data-source="post: 2020739" data-attributes="member: 1951"><p>This seems to have been covered in a lot of detail. Let me start with I have sorted ammo by bullet tip runout and proven with a limited sample that my groups change a lot at 0.005" TIR vs 0.015"TIR. Like 0.4" to 1.2", if I remember right.</p><p></p><p>To me, the main thing is to measure. I like the RCBS case master, but it looks like 21st century has an even better unit. I measure case runout 0.05" back from the edge. Under magnification, the mouths have irregularities. I measure bullets back 0.05" back from the top of the copper as bullet tips can be a bit irregular.</p><p></p><p>Yes, start with fired case TIR and build from there. My best setup is with Forster dies with the expander in. I bought their optional size balls. I find how my dies are tightened down is a big factor. Tighter was not better. Also, it helps to set positions with case in the die with a little handle pressure on it. Pushing to lock the body, pulling to lock the expander.</p><p></p><p>Yes, I tried type S bushing dies with the bushing loose and clamped. Clamped, I was about the same as the Forster die, but loose, writing up or down, TIR went to crap in 5 cases. I think it was due to lube getting into bushing area and binding it somewhat.</p><p></p><p>To me, fired case neck runout should be less than 0.001". Neck runout should be 0.0025" or less. Bullet tip runout should be under 0.005"....maybe 0.007"</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2020739, member: 1951"] This seems to have been covered in a lot of detail. Let me start with I have sorted ammo by bullet tip runout and proven with a limited sample that my groups change a lot at 0.005” TIR vs 0.015”TIR. Like 0.4” to 1.2”, if I remember right. To me, the main thing is to measure. I like the RCBS case master, but it looks like 21st century has an even better unit. I measure case runout 0.05” back from the edge. Under magnification, the mouths have irregularities. I measure bullets back 0.05” back from the top of the copper as bullet tips can be a bit irregular. Yes, start with fired case TIR and build from there. My best setup is with Forster dies with the expander in. I bought their optional size balls. I find how my dies are tightened down is a big factor. Tighter was not better. Also, it helps to set positions with case in the die with a little handle pressure on it. Pushing to lock the body, pulling to lock the expander. Yes, I tried type S bushing dies with the bushing loose and clamped. Clamped, I was about the same as the Forster die, but loose, writing up or down, TIR went to crap in 5 cases. I think it was due to lube getting into bushing area and binding it somewhat. To me, fired case neck runout should be less than 0.001”. Neck runout should be 0.0025” or less. Bullet tip runout should be under 0.005”....maybe 0.007” [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How do you eliminate runout
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