My understanding is that all Savage magnum sized bolt heads are the same dimensions out front.
You will run into different dimensions on the length of the shaft, two sizes, short action and long action, and two different firing pin hole diameters.
The long action length bolt head shaft can be shortened to work in a short action bolt body but IIRC, it won't work the other way around, using a short action bolt head in a long action bolt body because of firing pin length differences.
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