So i came up with about 3.785 as COAL for the 338 edge with 300g SMK.
COAL i came up with for 300 win mag is 3.620.
Im not sure of these numbers, just what a quick google search yielded :)
So were looking at about about 5/32 difference in COAL.
Magazine could be worked for this, as long as the action can do it.
Seems like this has been addressed with 338sin, Im just wondering if a can do this (without the rifle in front of me, its hard to imagineer *lol*)

Stu