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Concentricity

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  #1  
Unread 02-10-2011, 03:29 PM
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Concentricity

I just got my Hornady Concentricity gauge set-up and measured the bullet runout on my current load I am working up for my Sendero 7mm. All 25 loads were within .0025, most were .002 or less. Is this an acceptable range?
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  •   #2  
    Unread 02-10-2011, 05:07 PM
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    Re: Concentricity

    Yes. The rule of thumb is that if it is =<.003, it is fine.

    I use one and my average appears to be around .0015 on the ten presses I measured it with.
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      #3  
    Unread 02-10-2011, 08:32 PM
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    Re: Concentricity

    I saw on here that some people measure the case necks rather than the ogives so I re-measured the cartridges on the necks and the run-out was significantly greater than was measured on the ogives (some were out .007" on necks but none were more than .0025" on ogive). As I did this I adjusted the run-out on the necks to be .0025" or better and when I re-checked the ogives again the run-out was .001" or less on all 25 rounds. So my question is, is it ok to adjust run-out on the necks?
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      #4  
    Unread 02-10-2011, 11:51 PM
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    Re: Concentricity

    I have one too and it is handy for bending them back but, it will not correct the neck from being off center. I use roller type device to measure the necks. Rolling them on glass is a fast way to check em.
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      #5  
    Unread 02-11-2011, 11:34 AM
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    Re: Concentricity

    You're in position to verify what I've said here all along -that concentricity gages(Hornady, H&H) mask runout. The reason your deviation seems to go up back on the necks is that the indicator is further from the pinned bullet nose. Further back on the body you would see even more, and further toward the bullet tip would show even less -on any ammo -with that gage.
    If you measured that same ammo on a Sinclair roller/v-block type gage, you'd find that your runout is actually greater than you think.
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      #6  
    Unread 02-11-2011, 12:04 PM
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    Re: Concentricity

    Quote:
    Originally Posted by WV Sendero View Post
    I just got my Hornady Concentricity gauge set-up and measured the bullet runout on my current load I am working up for my Sendero 7mm. All 25 loads were within .0025, most were .002 or less. Is this an acceptable range?
    just fine
    gary
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      #7  
    Unread 02-11-2011, 12:33 PM
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    Re: Concentricity

    Quote:
    Originally Posted by Mikecr View Post
    You're in position to verify what I've said here all along -that concentricity gages(Hornady, H&H) mask runout. The reason your deviation seems to go up back on the necks is that the indicator is further from the pinned bullet nose. Further back on the body you would see even more, and further toward the bullet tip would show even less -on any ammo -with that gage.
    If you measured that same ammo on a Sinclair roller/v-block type gage, you'd find that your runout is actually greater than you think.
    That is a good point. I have both the sinclair and the hornady. Loaded rounds that measure .005-6 on the sinclair show up as .002-3 on the hornady. I loaded some rounds for my 308 the other night and was adjusting my fl sizer. After I loaded some up I checked the runout on both and those were my findings. I need to play with my sizing die some more. I did have the runout down to .002 on the sinclair and I trust those numbers.
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