I don't think the picture does my new toy justice. I turned a long action model 700 338 Win Mag into a 338RUM. Shilen installed a 28" plus comp, #7 heavy varmint barrel and matte blued the entire thing, Timney trigger, McMillan did the stock and a Leupold 8.5-25x long range target scope topped it off. Weight is in the 14 pound range.
At some point a skim bed might snug it up but the fit to the stock is perfect, everything works with the exception of a slight issue with the rounds popping out of the mag well.
I took it out for break-in and it went just under MOA with my marginal handloads, 1/2 moa with factory ammo. I shot 40 rounds with no problems and recoil was mild and in the .308 range.
338 RUM is within 1gr case capacity of 338 Lapua and they have identical performance when fired from the same length barrel. Best of all it more than likely has the same bolt face measurements.
338 Lapua takes a magnum action and will need machine work. The 50fps you might gain with an Edge is not worth the extra effort to me.