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Old October 31, 2019, 06:36   #1
ArtBanks
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Shoulder set back.

In a recent discussion of the use of an RCBS precision mic for determining shoulder setback when resizing cases the question of what does one do once steel on steel contact is made between your shell holder and the bottom of the sizing die and you would like to have more set back.

This was my response.

The RCBS Precision Mic has been a very useful tool in my workshop. I often use a know good headspace gauge to confirm readings. Being from the " old school" I still believe in using the correct tool for each purpose.

If you are getting to the steel and steel contact and are looking for more setback, Redding makes shell holders of varying depths for that purpose. Works great for my precision ammo when stock shell holders don't get the job done without modification.



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Old October 31, 2019, 08:53   #2
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I've had decent luck with the Whidden click dies. Repeatability and ease of use is good. I use them in .308 and 6.5X284.
https://www.whiddengunworks.com/prod...t-bushing-kit/
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Old November 14, 2019, 13:17   #3
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I hurt the little bit of brain I have left buying the precision mic and those shell holders. Now while I have it all figured out more or less it amazes me how all over the map my store bought 5.56 is when I check it. I'm like whaaaaaat? Sure has been enlightening.
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Old November 14, 2019, 15:42   #4
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Quote:
Originally Posted by davedude View Post
I hurt the little bit of brain I have left buying the precision mic and those shell holders. Now while I have it all figured out more or less it amazes me how all over the map my store bought 5.56 is when I check it. I'm like whaaaaaat? Sure has been enlightening.
Excellent observation.
Most shooters are not aware of just how large the variation is with commercial ammo, even GMM. If you have the capability to check run out, you will be even more enlightened as to why properly hand-loaded ammo works so much better than commercial for precision shooters.
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Old November 14, 2019, 16:42   #5
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I just ground down one of my old shellholders a bit.
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Old November 14, 2019, 17:46   #6
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Quote:
Originally Posted by kotengu View Post
I just ground down one of my old shellholders a bit.
FTMFW right there.

Glad I'm not the only freak out there thinking outside the bun.
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Old November 15, 2019, 14:01   #7
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Quote:
Originally Posted by kotengu View Post
I just ground down one of my old shellholders a bit.
I love buying tools. It's a weakness, I know. :-)
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Old November 15, 2019, 19:39   #8
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Slight cam over?
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Old November 15, 2019, 20:01   #9
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The Redding shellholder sets I have are all "plus" sizes, giving a longer base to datum line dimension.

I've never needed a shorter case than stock shellholders and sizing dies produce (they're usually too short) but I would trim a few thou off in the lathe, or carefully file/sand the bottom of the die.
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