Why didn't Germany or Continental Europe develop big bore cartridges like the British did?

[DieJager]

There is also one more action size variety.
Mauser medium action size, depending on factory:
Mauser 98 has longer action by 1/4 inch then Yugo M48. (clone of mauser 98K)

I think that it comes from time when Zastava factory imported tools from FN factory in Belgium.
Thus, there is a possibility that also FN Mausers have shorter version of action. (?)

On FN size I may be wrong, but for sure Yugo shorter action is not the only shorter medium length action version in the world. Some other factories were doing the same.

On the other hand, Yugo rifle M70 for hunting, has proper length (longer) Mauser medium action, for which they manage to chamber 458 WM and 375 H&H.

I've got a Zastava M70 in 375h&h . Good rifle

 

[Huvius]

As far as Mauser actions are concerned, the receiver of the Mauser Magnum action is significantly longer and more massive than that of the classic Mauser 98 action. Only the bolt has the same diameter, but is also longer. I just compared a FN Mauser action with a classic Mauser Magnum action and a Brevex Magnum Mauser action. The difference is clear.

The Oberndorf magnums are dimensionally the same as a standard large ring action in every way other than length.
Bottom metal varied according to the cartridge used but even the screw spacing is the same, the recoil lug being farther back under the receiver ring on the magnums or better stated the receiver ring is farther forward, the lug staying in the same position.
The Brevex M300 was too but I do believe that the Brevex M400 was larger in some areas - maybe the receiver ring was bigger, not 100% sure.

 

[grand veneur]

I did not take any measurements, just compared the Mauser actions of my rifles. The size differences are clear.