Sorry for that , but it will not work so i´m linking the thread.
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=155056&an=0&page=0#Post155056

hope that works.

Starting my update:

WR made a cut in the front receiver ring from 11 to 3 o´clock. Deepness ca. 5mm.

The total amount of the thickness behind the upper locking lug is 10 mmm.

Reducing material at that critical area by 50 % is to my view creating a predeterminated breaking point.

Technically ( international not only teutonic !) indisputable.

Good for what ?
For proper loading long rounds - even by clips - it´s enough to cut a small radius at 12 o´clock.

So done by various makers (Rigby´s .416 , H&H .244 Mag and postwar production.300 Mag and .375 Mag. made up on standard length actions. Even to be seen on Original Oberndorf sporting rifles in Cal. 30-06 !).

Only additional effect of the way WR did it . To eject an u n f i r e d round.
An empty shell will easy pass the receiver without that treatment.