Comments on: A Look Inside Sierra’s 300m Underground Test Tunnel

By: Brian

Brian — Sat, 05 Sep 2020 02:24:06 +0000

how much did it cost? I want one!!!!

By: Aono

Aono — Mon, 09 May 2016 18:04:10 +0000

Sorry about that, I meant Richard above.

By: Aono

Aono — Mon, 09 May 2016 18:00:37 +0000

Joe: that is good to hear, but makes their lack of accurate G7 data all the more frustrating. The triple G1 mess has got to go. It’s frankly bizarre that in 2016 the gold standard for Sierra projectile ballistic data is the empirical shooting of their competitor’s chief ballistician.

By: Robert

Robert — Sun, 08 May 2016 23:48:37 +0000

Have visited and toured the underground reloading/shooting/testing facility and it was well worth the trip. Employees at Sierra are first class, top notch, very knowledgeable folks. Would like to go back someday.

By: Joe

Joe — Sun, 08 May 2016 18:17:56 +0000

These are secret tunnels just like Area 51. They don’t want you to know they exist and will deny it to the end. All that ballistic data is highly classified.

By: Richard

Richard — Sun, 08 May 2016 12:07:24 +0000

Sierra has used doppler radar on more than one occasion at the Yuma Proving ground. They aren’t new at this game!

By: Nic

Nic — Sun, 08 May 2016 09:48:29 +0000

I thought the rws factory in Germany had its own 500 m test range.
The advantage of an underground range, would be a more stable Temperature environment along the day, and from day to day. That is also why the French are keeping their expensive wines in underground cellars or “cave”.

By: Neil Gibson

Neil Gibson — Sun, 08 May 2016 08:27:19 +0000

ELR Researcher

It may be 1,000 m, but you are unlikely to get most bullets that far without hitting the roof. Even if fired from floor level, the tunnel looks about 3 metres high, so unless you are firing seriously fast and/or very low drag projectiles, most calibres up to 308 won’t make the distance. Calibres above and including 338 Lapua might just make it.

Mike C.

The reason for it being underground, other than the very important lack of wind, is most likely temperature stability. Differential heating of the tunnel due to the sun, i.e. the sun heating one side more than the others, would cause motion of the heated air within that varies during the day. This is not something you want. Bury it within the ground and this effect is greatly minimised.

By: chase

chase — Sun, 08 May 2016 03:30:31 +0000

Aono HAHA nice, sweet sweet subtle burn!

By: Mike C

Mike C — Sun, 08 May 2016 00:47:49 +0000

Don’t understand why it needed to be underground..