In race to make artillery shells, US, EU see different results

or US see a business while Europe see a cost. it's how business work: if you produce and consume your product, you at best earn nothing.

I also think US are a single entity while EU is multiple, US have traditionally a bigger defense industry...

Goodhart's Law will have a field day with your suggestion :)

A Euro-munition contest?

shell condition is definitely a big "if" there, the shells are inconsistently packed and apparently factory workers will steal the (hard) copper forcing wire that cleans the barrel from fouling from some of the shells... and powder that is not stored consistently is itself dangerous and unpredictable. heat, humidity, time, etc all can paradoxically increase the burn rate of powder grains, stabilizing agents leak out etc.

https://en.wikipedia.org/wiki/1967_USS_Forrestal_fire

there's an insane amount of 8mm mauser out there due to it being a relevant caliber for like 60+ years, and some of it has been stored in awful conditions and tends to... develop overpressure.

https://www.youtube.com/watch?v=AunvMjcJPHY

Aren't NK shells notoriously unreliable and have large rates of duds?