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Mike Irwin, I would refer you to P O Ackleys manual, volume 1, page 432. The 30 Belted Newton. It was a great cartridge and is the same as the 30/338mag. It is not the same cartridge as a 308 Norma Mag.
Sorry pal-pal that I don't have the correct info for you. You would think with the intense library I have that I would have something on it but I don't.
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