I'm coming up surprisingly blank on this one so I'll ask here since we have several smiths.... I want to build a long-range light carry rifle so I am using a Savage/Stevens action. I don't have it yet but already called Shilen and they assure me that a small shank 300WSM barrel from them is safe, so the cheapest way to acquire the action is a Stevens 200 in 308/243/7mm08. This would have a blind/box magazine. I've build on Savage before but the one unknown is what mods may need to be made to feed 300WSM shells from a mag made to feed 308? I assume I may need a new follower (cheap), but will I have to modify the feed lips to work with the wider cases?