Savage used to make all of their bolt actions off of the Long Action. Then over time they made different short actions. It can be confusing.

Yup just measure, if there is no earthly way a loaded 30-06 will even come close to fitting in your mag, then you have the short mag.

With Savages it is very possible that you have a franken-gun that was a regular long action that someone slapped a 308 barrel onto. No matter, it will still work great if that's the case, but you need to know if you are going for a DBM. If sticking with blind mag then it doesn't matter (with the long actions, true short actions with 4.52" 4.27" or 4.40" spacing is a totally different story) as long as your stock is for the 5.062" staggerfeed action with blind mag.

Good luck and let us know how you make out.