I have played with wildcats for years 30-378 and 338-378 and 378 weatherby s .
I dropp tube with H870 and pack 130 grs . need long bbls as 29 in
30-378 with 180 gr out at 3900 fps
338-378 with 210 gr at 3600 fps
378 with 250 gr at 3500 fps
Long range is not a challenge if you have range finders and a good scope . Flat trajectory helps some of the problem but not all.
Bullet weight takes care of wind some but you lose trajectory , balance is what?
50 BMG is horrible trajectory but great in wind and predictable same as a 308 .
308 is accurate but you better know the yardage within a yard at 500 plus or it sucks.
Speed ? Equals flat but balance bullet weight and BC .
I still like the 378 weatherby as my pick in 250 gr Barnes with a custom chamber and 30 in bbl and muzzle brake
light weight contour .Put a Nightforce with custom torrents set to yardage and good to go anywhere in the world for anything .
Flat little guess out to 600 yds but after that rangefinders . Game doesn't always wait for the ranging and your spotter etc .
Long range competion are not a good judge the CMP military shoots yes 308 can do it and 1000 yd is owned by 50 BMG variations in yardage changes the game .
Weight of the gun ? Carbon works but lightwiegt bbls are ok without it for 3 shot or cold shot so not needed. Under 10 lbs total not a problem .