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The other questions were on barrel length, plus what profile is the "norm"?

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What is the optimum barrel length? I assume 24 inch would be pretty fair and ideal for the ballistics and also usage in the field.

What barrel length did the usual length were the usual vintage Westley Richards .318 WRs? Many of the vintage rifles appear to have quite long barrels. This might be sometimes relative as the fore-ends are often shorter.

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Type A 318 WR

John here is a link to some Type A Mauser measurement details for the 318 (and others) which might be of interest, from the awesome Westley Richards 'The Explora' website.
If you search 318 on that site there are several rifles, both vintage and modern which are definitely worth checking out.