Going by the position of the recoil lug reinforcement, that John Rigby 9 of 25 Mauser 98 in .350 Rigby Mag is built on a modern Magnum length action, just like their Big Game rifles. Not a "Highland Stalker" standard length action. According to Jon Speed, it is quite easy to identify standard or magnum length actions, if there is a recoil crossbolt in the stock: As action screw distance is the same on intermediate, standard and magnum length actions, the recoil lug is more to the rear on magnum length actions. So on standard length actions a recoil crossbolt is about centered under the receiver ring, while on magnum length actions it is closer to the rear end, like on this .350 Magnum rifle.