It's ironic, but I was wondering the same thing a couple of weeks ago, so I pulled the stocks off my .222 and 30-30.Checked barrel dimensions with my calipers and they were a match. The magazine well is smaller on the 222 so there is a bigger gap between the trigger and the magazine, but it is covered by the bottom metal which has a smaller hole for the narrower 222 mag. Being an economy gun , I would guess Savage made a "one size fits all" stock.