The .338 bolt action was supposed to be a rifle to rival the .300 canning magnum but it failed to do that because it's not considerably more powerful than the .300, and is heavier than the .300 by 1 weight unit and also has a slower fire rate.
Now with the .300 AR added to the game it makes the .338 even less viable. It needs a buff. It's the best way to balance it out to compete with the .300. When it comes to choosing your big game rifle, it should be down to preferance, not one rifle being considerably better and the other being left to collect dust.
Current stats:
.338 Polymer Tips:
penetration 45
expansion 16
.338 Soft Points:
penetration 22
expansion 68
.300 Polymer Tips:
penetration 42
expansion 14
.300 Soft Points:
penetration 21
expansion 60
Recommended .338 buff:
.338 Polymer tips:
penetration 55
expansion 18
.338 Soft Points:
penetration 28
expansion 70