What I had seen in the past for the 338-300rum, which I think a lot of folks call "338 RUM," is a goodly bit shorter than the Edge, which is why, as I understand it, Shawn differentiated the two and titled the "Edge" as he did - since it has the "edge" over the concurrently developed 338 rum.

I also saw some interesting data, not sure it makes sense to me - I saw a claim the Edge has a 122grn h2o case capacity. This was compared to somewhere in the 114grn ballpark for Lapua, and 103-4 for 300rum, hence not making sense to me. Seems like an awful lot of growth for a simple neck up, and if it really has 8grn more capacity than the Lap, I'd expect it could outrun it, not just tie.

I'm far from decided upon which it'll be, but it didn't take much persuading to kick me out of the 7mm and 30cal boat for this build to focus on a 338.