First of all first post here, from AK so I figure I should build a 338 for moose/bear etc. and ran across this while doing some research.

Just got this from Wiki talking about a 338 RUM

"Because this cartridge already operates at very high pressures (65,000 PSI), Handloaders cannot give significant improvements over factory ammunition as many handloaders have done over the years with more conventional, lower pressure rounds"

is this correct?

Researching my first build I know I want to go 338 it's just what one now.

Norma, Edge, or just plain RUM or maybe even just buy a 116 in 338 win mag and call it a day.