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I had not even thought about the thread size!
Makes sense that the non-step action was standardized for the 416 and 350 Magnum and presumably used from that point on for new builds.

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Don't know as a fact, but if you are referring to the current Rigby builds, I doubt any Highland Stalker based rifles use the same action as the "Big Game model" .416 rifles. The Highlamd Stalker rifles are designed as "medium action" rifles not big game rifles. Specific action sizes? Don't know.

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I was referring to the run of pre war Rigby 416s and 350s.
The new 350 looks to be on a standard length action.
There is certainly good reason to use a magnum length action for the 416, although as we know Rigby also built the occasional 416 on a standard action, but the 350 doesn't really need to be a magnum length any more than a 333 or 404 Jeffery do.
Of course, once available, Jeffery used magnum '98 actions for those too, so maybe it was a cache' deal - making sporting rifles on actions that were never meant to be for military use.

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He who lives in the past is doomed to enjoy it.

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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.

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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.

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Good observation. Thanks for the information.

So does the mength of the .350 Rigby Magnum justify a magnum length action? Even if capable of using a standard length action? If so, I could imagine most London Best custom users choosing the magnum length action as a definite choice.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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