Neither 300 Dakota or 300 Norma are going to work in a standard magnum action . The Dakota is based on the 404 Jefferies case and the Norma is a proprietary case with the same case head as a 338 Lapua . A 300 RUM will fit in a standard Rem magnum action .
The SAUM's shoot but brass availability is problematic .
The freebore with the Weatherby cartridges was done by them to get the velocity they wanted for advertising and is bad from an accuracy stand point , it doesn't have to be there . A custom reamer fixes that and all the issues typically associated with belted mag's .
Weatherby brass has issues because of the compound radius on the shoulder and being made by Norma it is soft .
No reason to reinvent the wheel , with bullet choice today there is no reason to choose a 30 over a 7 . If it was me I'd go 7 WSM or 7-300 WSM , brass availability which is crap for everything but oddballs and orphans now so it's only marginally better , and have the reamer cut to run the Berger 180's .
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