You can neck size then trim. Magnum cartridges and those that are way overbore tend to stretch brass more than the aforementioned -06. Now that the case is fire formed it probably wont stretch the neck as bad on the second firing if neck sized. I don't have any experience with the Hornady brass but for what it's worth the info I have gleaned on the subject from the internet seems to indicate that Lapua brass is the way to go with this cartridge. You may want to check the length of the brass on some factory rounds just for giggles cause I have seen a couple of different lengths listed for this cartridge.
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