Very nice Mauser that I'm sure you will enjoy using. The rearward stock pin does seem quite far back as mentioned by Igorrock. My Mauser 404 which started life as a 10.75x68 also has the stock pinned in three places, the first two identical to yours but the rear pin just in front of the rear action screw. My stock is original Mauser factory with no sign of splitting anywhere. I've attached a photo just for comparison.

Now if you lived here I would give you the last of my stock of early RWS 347gr steel jacketed flat nose bullets, just made for the 10.75. They are very accurate in my rifle and would be good medicine for pig and buffalo.