I am not certain that the Lapua has much more to offer than the 338 RUM or 340 Wby, many sources say that there is an advantage, but then again this is also claimed to be the case with 300RUMs versus 300 Win Mag. I guess time will really tell the story.
1 thing I do find is that it is a very precise caliber and has truly outstanding capabilities. So far I have not been disappointed with the Lapua for real long range shooting.
Whether the many military forces adopting it ,is relevant is questionable, afterall 30 years ago the formidable 308 was displaced by 223, and now we are seeing a turnaround there.
Lapua seems to have gone to great lengths to seemingly perfect a cartridge to be accurate and effective to 1500 yards and better, and there seems to be lots of documentation attesting to its performance, yet little has been produced extolling the merits of the 338RUM or the 340Wby, in the same manner, this may just be marketing, but I personally do not think this to be the case. The documented capabilties of the Lapua
seem to speak for them selves.
KK