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Shoulder Bump Measurement Check

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  #1  
Unread 07-05-2010, 04:01 PM
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Shoulder Bump Measurement Check

hey guys,

i was wondering how much headspace slop is normal?

i'm starting some more loads for the .330 rum. now that i have a few more measuring tools i wanted to go through all the steps to make sure i get the most out of my reloads.

i determined my seating depth with my hornady OAL gauge. so i figured i would move on to the next step in precision reloading ; )

now i've been reading in to my shoulder bump vs neck sizing. the last cases were neck sized, but the shoulder bump makes sense so i figured i would take some measurements.

using the 420 headspace bushing from hornady i measure a fire formed case and came up with a measurement of 2.464" then i measure a FL sized case and came up with a measurement of 2.458"

so there's only a .006" bump from fire formed to full length sized. is this a big difference?

does this seem right? this is all pretty new to me and i don't have much reference to what the norm is. thanks for the help guys.

by the time i figure this whole thing out i'll need a new barrel. damn 300 RUM

Last edited by Michael J. Spangler; 07-05-2010 at 06:27 PM. Reason: stupidity
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  •   #2  
    Unread 07-05-2010, 06:09 PM
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    Re: Shoulder Bump Measurement Check

    Michael,

    Are you sure those numbers are correct? A case should not be .196 longer after having the shoulder bumped back.

    Chris
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      #3  
    Unread 07-05-2010, 06:24 PM
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    Re: Shoulder Bump Measurement Check

    I don't know much but it sounds to me like your full length die needs to be screwed down into the press a little more. I ran into this same problem a couple years back. If the die is out to far it will stretch the case.

    Hope this helps,

    -Nathan
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    Unread 07-05-2010, 06:26 PM
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    Re: Shoulder Bump Measurement Check

    sorry i tend to put too much though in to what i'm trying to type to the point of not typing what i'm thinking about, if that makes any sense

    edited
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      #5  
    Unread 07-05-2010, 06:55 PM
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    Re: Shoulder Bump Measurement Check

    Well now, Those numbers look a heck of a lot better. By most folks standards you're still going a little to far for shoulder bumping. You should try to set your sizer up so your sized cases come out in the 2.462 ballpark, any more than that and you're working your brass more than neccessary.

    Chris
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      #6  
    Unread 07-05-2010, 07:05 PM
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    Re: Shoulder Bump Measurement Check

    ok cool thats what i thought. like i said i don't have any type of reference on this stuff, so i was making sure this was normal.

    the first reload i had just neck sized but i figured i could set up the die for a .001" to .002" bump.

    are there any good ways to set a die and not have to re-set it each time i want to switch a die out? i know my RCBS dies have a set screw on the lock ring, but are there any better ways?

    thanks guys. i love this stuff
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      #7  
    Unread 07-05-2010, 08:37 PM
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    Re: Shoulder Bump Measurement Check

    Other than setting the lock nut, I don't know of any other way to save your die setting. I put witness marks on mine to make it easier to set


    Set your shoulder back .001" or as close as you can get to that.
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