Re: Turn necks on virgin brass?
Ditto BH & Mike
Turn first but you probably will have to expand the necks so you can get the turning mandrel in. It depends upon what kind of turner you have. I have the Forster turner and run the cases through a Lee Collet Neck Sizer and it is just right for a tight but not too tight fit. The new cases are typically too tight for the mandrel and if you use an expander ball for necks then that typically does not open the necks up enough for the mandrel.
Consistancy does help in any aspect of reloading. Here was a good previous discussion
To turn or not (necks)
especially the most recent posts.
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