Fire forming cases

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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.

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Alpha1
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Fire forming cases

#1 Post by Alpha1 »

A dodgy re loading die has left me with a quantity of once fired Lapua brass with the shoulders set back to far. I am reluctant to throw them away. I was wondering if I could fire form them back to original dimensions. Any advice on a suitable method would be appreciated.
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Sim G
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Re: Fire forming cases

#2 Post by Sim G »

Load them, shoot them. The cases will then be fire formed to your chamber dimensions.
In 1978 I was told by my grand dad that the secret to rifle accuracy is, a quality bullet, fired down a quality barrel..... How has that changed?

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Re: Fire forming cases

#3 Post by Alpha1 »

I am a bit wary of doing that as the shoulders are set back that far the cases rattle about in the chamber.
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ovenpaa
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Re: Fire forming cases

#4 Post by ovenpaa »

You could pass a mandrel through them at 7,0mm then neck size only to suit the 6,5 and the false neck with hold the case head back against the bolt face. This does depend on how far back you have set the shoulders.
/d

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Re: Fire forming cases

#5 Post by Sim G »

I can't see any other way of getting the shoulder forward to where it was before. Much the same way as forming Ackley Improved brass from standard factory loadings. If it makes you feel better about it use the "starting load" data.
In 1978 I was told by my grand dad that the secret to rifle accuracy is, a quality bullet, fired down a quality barrel..... How has that changed?

Guns dont kill people. Dads with pretty Daughters do...!
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Re: Fire forming cases

#6 Post by Alpha1 »

I like ovenpaa,s idea I think I will give it a try.
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Re: Fire forming cases

#7 Post by WelshShooter »

You could use a starting load from a load you may have fired before, or you could use a fast pistol powder load which is described in The Library:
http://full-bore.co.uk/viewtopic.php?f=36&t=810
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Re: Fire forming cases

#8 Post by The Gun Pimp »

Alpha1 wrote:A dodgy re loading die has left me with a quantity of once fired Lapua brass with the shoulders set back to far. I am reluctant to throw them away. I was wondering if I could fire form them back to original dimensions. Any advice on a suitable method would be appreciated.
Shouldn't be a problem - but you could load the bullet slightly forward so that the primer is held against the boltface.
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Re: Fire forming cases

#9 Post by Alpha1 »

Alpha1 wrote:
A dodgy re loading die has left me with a quantity of once fired Lapua brass with the shoulders set back to far. I am reluctant to throw them away. I was wondering if I could fire form them back to original dimensions. Any advice on a suitable method would be appreciated.


Shouldn't be a problem - but you could load the bullet slightly forward so that the primer is held against the boltface.
That sounds sensible. I just need a 7mm mandrel now. Im frustrated I would have had one made in a heart beat except my Lathe is goosed. I have tried and failed to find a replacement part for it.
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Re: Fire forming cases

#10 Post by ovenpaa »

Alpha1 send me a drawing, I am on the lathe this morning making a mandrel for myself (31,0mm)
/d

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