Hey guys as I stated in another post I'm in the process of rebarrelling my Remington 700 Sendero currently chambered in .338 win mag. I'm hearing some suggestions to rechamber for .338 ultra mag. I've seen something about .338 EDGE. What is the best .338 caliber chambering for precision long range huntin on whitetail mule deer and elk at distances out to 1,500 yards? I may also go .30 caliber to use a Lilja 3 groove barrel. What would be the best .30 caliber round for the same application? Thanks guys.