Built a 338 RUM on a Savage Target action for my shooting buddy. 32" Rock Creek barrel provides 2950 fps with a 300 gr SMK over Retumbo.
If you want a truly ultimate long range round, consider the Kirby Magnums.
That's damn speedy for a .338 RUM, That beats the edge and the Lapua and it's right in the velocity range of the improved edge and Lapua improved cases, with 30" and 32" barrels.
