can you ID these bolts

[ActionYobbo]

Here is whats got me stumped. I have inglis 8mm bolts that are British proofed after 1954. So where would the British have sent or suppied 8mm brens or why would the British proof a bolt but not mark the caliber on it?
These are the only British proofed bolts I have ever seen that are not stamped 7.62

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[TactAdv]

Here is whats got me stumped. I have inglis 8mm bolts that are British proofed after 1954. So where would the British have sent or suppied 8mm brens or why would the British proof a bolt but not mark the caliber on it?
These are the only British proofed bolts I have ever seen that are not stamped 7.62

That's the unique thing about the S.A./DENEL conversion to 7.62mm NATO, it uses dead-stock .303 caliber BOLTS with only 7.62mm extractor (functionally same as "8mm" extractor) installed! All the headspacing/fitting issues are handled by a clever recontouring of the rear chamber face dimensions of the new-made 7.62mm NATO caliber BARRELS they developed for the conversion. One only needs to install the new 7.62mm caliber barrel and exchange the 7.62mm extractor in the stock original .303 caliber bolt and it's ready to go in 7.62mm caliber (magazine issues not discussed here, only bolt and barrel issue) the new design barrel is designed to headspace properly against the original .303 bolt length.

It is a beautiful conversion- I've been running my all-original '42 Daimler MK II in 7.62mm caliber perfectly, flawlessly reliably by exchanging ONLY the extractor, S.A. barrel, and dropping in stock Zb-39 magazines to feed. That three piece combination runs FLAWLESSLY reliable in 7.62mm NATO caliber!!

I will note NOTHING was done or needed to be done to get proper headspace lockup, just drop in barrel. This is my personal experience and reflects the fact I am doing this to an all original military issue receiver unmolested as it came from the factory- a cut and welded back together receiver may be an entirely different story....I can't speak to that situation, but as the South Africans intended, it works flawlessly.
-TomH