Please forgive me in advance ...........but...........
Why would anyone stuff a pecker wood bullet in a 338 RUM? Ya may as well go back to the '06 and shoot something with at least a somewhat respectable bc.
Or maybe you're not considering Long Range game taking? Or you're skeerd of the recoil. Shooting a 338 RUM with a 200 gr bullet or less just doesn't seem manly.
Stick a 300 SMK in front of some Retumbo and go after it.
The above is a bit tongue-in-cheek, but I really don't understand and advantabae of a light bullet in a big bore cartridge. Any counsel would be appreciated.