Re: 338 RUM vs 338 Edge
If you don't need the extra performance you get from the Edge, then you might want to stick with 300 RUM or 338 RUM so that you can use standard dies and factory ammo.
In other words, consider your target & distance. Then, figure out what bullet, barrel twist, and MV you need to get the job done. That will pretty much determine the cartridge and barrel length.