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umm isn't there a pressure difference between the 2 and also a case thickness difference?
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NO & YES.
Pressure is minimal in difference, so in thoery yes, but in practice it makes no differenece at all. The METHOD of measuring pressure is different, not the pressure itself.
Yet the NATO spec cases are thicker. but this has zero bearing on using it interchangably as the difference is in internal volume, not external dimensions.
The only time you'd need to worry about this is if you are creating a load
based on one & transferring it to the other. Usually about 1~1.5 grains of powder takes care of the difference. To put it differently that's about the difference needed to change MV by 100~150 FPS.
I obviously can not have been firing them interchangably in both "calibers" of rifle for 20 years without a problem, yet somehow I have been. sooooo...........
