What is the longest indoor range US or World?

[Airgunner7]

Just wondering who has the longest private/public indoor range in the world or US?

 

[Kevin Thomas]

Sierra's was the longest privately owned when it was built in 1990, at 300 meters. Since then, Lapua has built a 300 meter test range (in Mesa, AZ). I think there may be at least one other, but who it is escapes me right now.

 

[Airgunner7]

Thanks

 

[Airgunner7]

Bump, any public ones?