The 7mm-308 norma mag maybe a bit close for the work and money to the 7mm Rem mag, the 7mm STW is easier in a .532 bolt face but might not fit in your mag with out lengthening the 7mm Dakota would fit but needs a .545 bolt face. If you're wonting a simple wildcat with a belt which will fit into your mag beter the 7mm practicle might be a beter bet than the shorter 7mm-308 norma mag for performance and ease of building your rifle and there is already a reamer and loading data available in NZ. But don't forget the good old 7mm mag and 162 Amax.
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