Depends upon your use and accuracy expectations. If mainly for hunting and you are adept at loosing brass (read expensive) you will be happy with something like PPU. If you intend doing a lot of target shooting go with Lapua.
In my 308s I use Lapua mostly and in one rifle Petersen. Plus I'm still using ancient CAC in another. CAC still rates as one of the best brass made. Obviously not freely available anymore though so hardly worth recommending.
I suspect if you are getting Dean Maisey to do the build it is something better than norm and will cost higher than norm so go Lapua.
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