The firing pin has to go through the cross pin that holds the bolt head to the body. That didn't leave much material with the larger firing pin and some cracked-- so they went smaller.
The firing pins will either be .145 or .095 with all the new ones being the smaller size. But.... I think (and am often proven wrong) that savage used the smaller size for magnums long before they completely switched over so a good chance that you will already have the correct setup.
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