BSA use to chamber Lee-actioned rifles in a number of calibres, one was a .375 Flanged Nitro-Express. Suppose to shoot a 270gr projectile at 1975fps. Taylor didn't think much of it though.
They also made a .330 BSA and a flanged version of the 8mm mauser called the .315 Austrian Mannlicher.
You can probably load them a bit hotter in the P14.
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