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Is there a 'real world' performance difference between the two?

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There may well be a legal difference between the two.

If the legal minimum is .375" there is a difference.

If the energy levels are the minimum eg in Zimbabwe and reportedly hotly loaded 9.3x62's may just exceed the minimum, again the legal minimum may not have been achieved with a 74mmR.

Whether or not, the legal minimum standards will be applied is another thing.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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