G'Day Fella's,

Handloader 52, my .404 Jeffery is based on an FN Browning Safari action, which was originally chambered in ? caliber.
Next time I have it out, I will have a good look over it as I'm not intimately familiar with this aspect of the action. A mate of mine (who just happens to be Jumbo hunting in Africa at present), has an original FN Browning Safari, in .375 H&H Mag. But again, I'm not familiar with this aspect of it either.
What I can tell you is, these actions have no thumb cut-out, in the left bolt lug race way.
Also, the left bolt race way is not a true copy of the Mauser design, as it is open at the very front of the race way, where it meets the rear of the barrel!

Apart from that, these actions appear to be a copy of the Mr Mauser, M98 controlled feed action and like just about everything that FN and Browning make, it is very well finished!

I hope to get back to you shortly with the above detailed info.

Doh!
Homer