I am sure that this has been covered as some point in this forum. But I cannot seem to find the info that I am looking for. I just purchased a brand new action. It is listed as an 300 RUM action. As far as I can tell the 300 win mag and 300 RUM have the same bolt face and are on a long action. Is there differences in the actions? Do they take the same box mag? When I purchased it I was thinking about building a RUM, but have changed my mind due to the cost of brass and the difficulty to find it. I am thinking that I am going to build a 7 STW instead. I have this thing for 7mm. Thanks in advance.