Just finished my first RUM build this weekend and WOW! This thing is a blast to shoot! I was thinking about a getting a Lapua, but then stumbled across a great deal on 338 RUM brass and dies, so I decided to go that direction. Glad I did.

Savage 110 centerfeed.
McGowen 26" 1/9 twist bull barrel with break.
HS Precision with bottom metal off a savage Lapua.
AICS 338 CIP mags
Sightron SIII 8-32x56
Blackhawk 20 moa rail
Burris rings
GG&G bipod