If I am not mistaken the .338 Lapua is a necked down 416 Rigby.
Hornady makes some reasonably priced .338 Lapua brass.I am not real fond of necking up,I'd rather neck down,but I have had good luck necking up with the Cream of wheat trick.
I have even made a chamber insert of the desired case using a chambering reamer,and turning the outside of the insert to drop into an old break action single 12 ga for firing the cream of wheat loads.Worked great!
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