At the time, Norma indicated that the cartridge was not intended for factory rifles. It had been developed specifically as a "Magnum" load for M1903, M1903A3 and M1917 rifles, which were cheap surplus at the time. The conversion from .30-'06 was fairly easy and made that $29.95 rifle into a Magnum, capable of taking any game in North America. (OK, the .30-'06 could have done that, but the .308 Norma Magnum would presumably do it better.)
Jim
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