Note the Lapua material spec. on the case drawing.

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03 August 2009, 02:19

SR4759

Note the Lapua material spec. on the case drawing.

Just for future reference.
Usually cartridge brass is Cu70Zn30.
This is brass with 2% more copper.

04 August 2009, 01:49

homebrewer

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?

04 August 2009, 01:56

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.

04 August 2009, 02:24

SR4759

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?

04 August 2009, 03:07

rolltop

quote:
Then what is your point?

just correcting your math

04 August 2009, 04:45

Doc224/375

It's simply more malleable than usual brass ( Softer ).

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

06 August 2009, 08:37

lawndart

This is reason 436 why I love Lapua brass.