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Seemingly, not much CIP compliance.

I have 2 boxes of 9MM Mauser Kynoch 245gr. ammo (19rounds). The bullets measure .355/6 at the case mouth.

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In that CIP was only enacted in 1969 dimensions would seem to have been open to gun and ammunition makers “interpretation” back when most of these rifles were made.
Keep in mind some original .404/10.75mm had .418” groove-groove barrels and .422”-.423” bullets.
The oversized bullets worked well enough and simply were squeezed to size in the throat. Soft(ish) jackets of cupronickel, mild steel, or gilding metal and cup & core bullets.
- Mike

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"Here's to killing people you don't like with people you do"

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