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Gundog, you are right on the two points you mention.
Rigby did in fact commission Mauser to produce the first magnum length actions for the 400/350 rimmed cartridge.
These actions had a bit of a slanted magazine which tapered toward the front for the rimmed cartridges and had what is widely referred to as a "step ring" magnum action.
The step is a reduction in the diameter of the receiver ring where the barrel threads in. I don't know why they did that though.
The 400/350 used a bullet of 310grs and the 400/350No.2 which had the exact same case used a pointed bullet of 215grs at a higher velocity.

The later 350 Rigby Magnum rimless cartridge was, I believe, only offered with a magnum length action with the fully cylindrical receiver ring.

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I'm always talking about how 'pretty' the .350 magnum cartridge is, but the 400/350 if anything is even prettier. I believe John Taylor, who loved the magnum, also said he preferred the 400/350 because of its heavier bullet. If I'm not mistaken, the 400/350 was the first cartridge offered by Rigby for the magnum action, around 1899-1900. Original Rigbys in 400/350 seem to me to be much rarer than the .350 magnum but are priced about the same.

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The 400/350 is considered to be the first of the magnum length Mausers and was built for Rigby, who had exclusive import rights for Mauser actions. It was, and still is, a great round but was over shadowed when Holland introduced it's 375.






This one is a rifle gunmaker Lon Paul brought up on a spring Brown bear hunt with me on the Alaska peninsula

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The 400/350 is considered to be the first of the magnum length Mausers and was built for Rigby, who had exclusive import rights for Mauser actions. It was, and still is, a great round but was over shadowed when Holland introduced it's 375.






This one is a rifle gunmaker Lon Paul brought up on a spring Brown bear hunt with me on the Alaska peninsula

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Sir,

Where did you get ammo? I need to find some!

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Sir,

Also where did you get the sling? It's very nice.

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The 400/350 is considered to be the first of the magnum length Mausers and was built for Rigby, who had exclusive import rights for Mauser actions. It was, and still is, a great round but was over shadowed when Holland introduced it's 375.






This one is a rifle gunmaker Lon Paul brought up on a spring Brown bear hunt with me on the Alaska peninsula

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Sir,

Where did you get ammo? I need to find some!

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Bertram in Aust make the brass and it is expensive. I know as I bought some from Bruce.

If anybody knows anybody else who makes 350Rigby magnum brass could kindly tell me who.

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I'm always talking about how 'pretty' the .350 magnum cartridge is, but the 400/350 if anything is even prettier. I believe John Taylor, who loved the magnum, also said he preferred the 400/350 because of its heavier bullet. If I'm not mistaken, the 400/350 was the first cartridge offered by Rigby for the magnum action, around 1899-1900. Original Rigbys in 400/350 seem to me to be much rarer than the .350 magnum but are priced about the same.

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Thank you, anyone you know in the US that sells/loads the 400/350no.2?

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http://www.gunbroker.com/Auction/ViewItem.aspx?Item=524843543

m4220

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Anyone sell 350no.2 bullets?

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