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Note the Lapua material spec. on the case drawing.
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SR4759
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posted
Just for future reference.
Usually cartridge brass is Cu70Zn30.
This is brass with 2% more copper.

 
Posts: 13978 | Location: http://www.tarawaontheweb.org/tarawa2.jpg | Registered: 03 December 2008Reply With Quote
homebrewer
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quote:
This is brass with 2% more copper.

I ain't no metallurgist, but is the 2% increase in copper to make the cases more conducive to multiple resizings?
 
Posts: 16534 | Location: Between my computer and the head... | Registered: 03 March 2008Reply With Quote
rolltop
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quote:
This is brass with 2% more copper.

If one does the math he finds it is actually 7% less zinc and this can help to make the brass less brittle but also less hard.

I'm not sure it's a better brass for the difference in alloy composition.
 
Posts: 908 | Location: Western Colorado | Registered: 21 June 2006Reply With Quote
SR4759
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quote:
Originally posted by rolltop:
quote:
This is brass with 2% more copper.

If one does the math he finds it is actually 7% less zinc and this can help to make the brass less brittle but also less hard.

I'm not sure it's a better brass for the difference in alloy composition.


Then what is your point?
 
Posts: 13978 | Location: http://www.tarawaontheweb.org/tarawa2.jpg | Registered: 03 December 2008Reply With Quote
rolltop
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quote:
Then what is your point?

just correcting your math Smiler
 
Posts: 908 | Location: Western Colorado | Registered: 21 June 2006Reply With Quote
Doc224/375
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It's simply more malleable than usual brass ( Softer ). archer

I would be most interested if anyone can conjure up specs on Laupa annealing process !.

archer
 
Posts: 4485 | Location: Planet Earth | Registered: 17 October 2008Reply With Quote
lawndart
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This is reason 436 why I love Lapua brass.


 
Posts: 7158 | Location: Snake River | Registered: 02 February 2004Reply With Quote
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