Sizing for 338 edge
So my next build is going to be a 338 edge. Now I'm not new to reloading, however I am new to wildcats. I'v read that you can use a 338 RUM die(which i already have) to size for the edge. Is this true and if it is can someone please break it down "barney style" for me. I guess I'm confused, the 338 RUM has the shoulder pushed back, Wouldn't it resize the 300 RUM shoulder to the 338 RUM demensions? I've seen the sentence " you'll have to back the 338 RUM die off a bit." Can anyone help me to understand this? Thanks.