A peculiarity about the 308 during the 60's and 70's (not sure of the exact period) was that the rifles and ammo in that caliber were exempt of sales tax. So they were a cheaper option.
This was because CAC made the 308 ammo here in NZ (that and 303). Later CAC started making .270 (firstly branded for the Forest Service) and .243 ammo and the sales tax went back on.
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