found this in the FAQ section:
Long Actions:
The action screw spacing on Savage long actions has remained the same since it's introduction in 1958. However, this does not mean they are all the same as the magazine port length in the bottom of the action can be one of three different lengths depending on the cartridge the action was originally made for.
From 1988 to 1997 all Savage bolt-action rifles were made on long-actions. Those chambered for short-action cartridges have a shorter magazine port cut to work with the existing short-action magazine boxes from previous years. As such, even though the action is technically a long action you can not mount a long-action cartridge magazine to it without having the magazine port lengthened.
Additionally, larger cartridges such as the .375 H&H and the Remington Ultra Mag cartridges required a longer magazine box and consequently a longer magazine port in the bottom of the action. As such, changing from a .30-06 length box to one of these cartridges will also require that the magazine port be lengthened.
http://www.savageshooters.com/conten...el-Shank-Sizes
Bruce
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