New Norma Brass, Anneal before working?

[richbug]

I am going to neck up some New Norma 8x57r brass to 10mm for a project I have been working on. Thoughts on re annealing it before trying to stretch the necks? Plan is to take it to .35 first, then 10mm. Making a long tapered mandrel on the lathe to do the work that fits into a Lee die body.

This brass doesn't grow on trees, so I would hate to lose any.

[Hickory]

Re-annealing would be a good idea.

[Wayne Smith]

NO! Unless you are fireforming. Necking up places downward pressure on the shoulder and you will collapse the shoulder if you anneal first. If you are fireforming than yes, anneal first.

[Hickory]

I did not consider the downward pressure collapsing the case. Looks like I got that one wrong.
Thank goodness for those with experience.

[richbug]

I appears not annealing is the right answer. I ran 25 pieces through my 2 expanders, and only damaged one due to my own error(I think I can fix it though, just a fold at the neck because it wasn't lined up perfectly).