The Edge betters the 338 RUM by 150fps in a 28" barrel, remove 50fps if in a 26".
I have a 338 Edge on a Rem Sendero action, I have to double load, that is one in the chamber and another in the mag that only just fits above the feed ramp. It has bound up on me in the past.
I also have a 300WM shooting 215 Bergers and a 338-416 Rigby Improved 45 degree shoulder. All 3 are capable to 1200mtr, the 338-416RI is a genuine 2000mtr capable cartridge. I have taken it to 1800mtrs here on steel only. 2 sighters and I was on, however this rifle is not something you want to be carrying in the mountains, it weighs almost 16lbs. Most of this is in the barrel, it is 32" long and is a straight 1.25" from chamber to muzzle with 6 flutes and a muzzle brake close to 3/4lbs.
It is built on a CZ550 Safari Magnum action with the bolt handle straightened and bolt knob filled and re-shaped.
My Edge would function better with a 4.00" Wyatt's box, but they are hard to get here in Australia.
Cheers.