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#7179599 - 05/25/18 08:45 AM Berm for .50 BMG?
FiremanJG Online   content
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Registered: 12/16/08
Posts: 24874
Loc: Wolfe City, TX
I have found some data that is showing me what it will take. I was wondering if anyone has more data.

Here's the worst case scenario, armor piercing at 50 yards, multiple rounds.

What I'm looking at is a left side, back, right side cross tie enclosure, 8' wide X 8' deep, 4' to 5' high. A sheet of 1/2" AR 500 on the back wall, then the whole thing filled with dirt.
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#7179808 - 05/25/18 11:31 AM Re: Berm for .50 BMG? [Re: FiremanJG]
BigPig Offline
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Registered: 08/27/09
Posts: 12317
Loc: Forney, Tx
We just shoot our AP rounds into a plastic 55 gallon drum fille with sand, in front of a regular berm. 8x8 is pretty big, unless you plan on missing
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#7179836 - 05/25/18 12:06 PM Re: Berm for .50 BMG? [Re: BigPig]
FiremanJG Online   content
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Registered: 12/16/08
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You understand it's 8 wide, 8 deep, but mot 8' tall right? It will be used at 600 yards, also. That's about how wide the current berm is.
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#7179870 - 05/25/18 12:31 PM Re: Berm for .50 BMG? [Re: FiremanJG]
Cast Online   happy
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Registered: 12/14/08
Posts: 18164
Loc: North Texas - God's Country
At 600 with a fifty and an 8í berm. I wouldnít pull the trigger. Too easy to overshoot that little berm. That round is way too destructive. Itís gotta be stopped every time.
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#7179875 - 05/25/18 12:33 PM Re: Berm for .50 BMG? [Re: FiremanJG]
SapperTitan Online   content
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Registered: 11/17/10
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Didnít you watch the original tremors movie? The 50 BMG doesnít penetrate dirt well
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#7179877 - 05/25/18 12:34 PM Re: Berm for .50 BMG? [Re: FiremanJG]
FiremanJG Online   content
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bang IT WILL NOT BE EIGHT FEET TALL!

With a proper scope, it's easy to keep rounds on the berm. Didn't have any .308 leave berms yesterday, while I was teaching. And that was a new to that distance shooter.
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#7179878 - 05/25/18 12:35 PM Re: Berm for .50 BMG? [Re: SapperTitan]
FiremanJG Online   content
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Registered: 12/16/08
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Loc: Wolfe City, TX
Originally Posted By: SapperTitan
Didnít you watch the original tremors movie? The 50 BMG doesnít penetrate dirt well


I'm thinking 8 feet of dirt, for it to travel through, will get it done.
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#7179899 - 05/25/18 12:47 PM Re: Berm for .50 BMG? [Re: FiremanJG]
Cast Online   happy
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Registered: 12/14/08
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Loc: North Texas - God's Country
Originally Posted By: FiremanJG
bang IT WILL NOT BE EIGHT FEET TALL!

With a proper scope, it's easy to keep rounds on the berm. Didn't have any .308 leave berms yesterday, while I was teaching. And that was a new to that distance shooter.


I see that now, thatís even more dangerous.

Hey, visit NTSA and look at their 50 yard range. Itís set up as you describe with a taller berm. You might get some ideas re construction.
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#7179917 - 05/25/18 01:08 PM Re: Berm for .50 BMG? [Re: Cast]
FiremanJG Online   content
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Registered: 12/16/08
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Loc: Wolfe City, TX
Originally Posted By: Cast
Originally Posted By: FiremanJG
bang IT WILL NOT BE EIGHT FEET TALL!

With a proper scope, it's easy to keep rounds on the berm. Didn't have any .308 leave berms yesterday, while I was teaching. And that was a new to that distance shooter.


I see that now, thatís even more dangerous.

Hey, visit NTSA and look at their 50 yard range. Itís set up as you describe with a taller berm. You might get some ideas re construction.


That height is not dangerous. My berms are 5' tall, max, and work every day. The guys shooting the .50 will be competent. This is not for general use.

I've read what the military has decided is sufficient thickness, and it looks like I'm doubling what they require.


From: The Ultimate Sniper: An Advanced Training Manual for Military and Police Snipers by John Plaster.†

Sand at 600 meters: 12"†
Sand at 1500 meters: 6"†
Clay at 600 meters: 26"†
Clay at 1500 meters: 21"†

50 Cal armor piercing (Muzzle velocity not given):†

Sand at 600 meters: 12"†
Sand at 1500 meters: 6"†
Clay at 600 meters: 27"†
Clay at 1500 meters: 21"†

50 AP at 100 yards:†

Concrete 9"†
Timber (logs) 96"†
Dry Soil: 28"†
Wet Soil: 42"†
Dry Sand: 24"†
Wet Sand: 36"†
Dry Clay: 42"†
Wet Clay: 64
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#7179924 - 05/25/18 01:12 PM Re: Berm for .50 BMG? [Re: FiremanJG]
TexFlip Online   content
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Registered: 08/18/12
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Might wanna go higher than 8'.

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#7179962 - 05/25/18 01:55 PM Re: Berm for .50 BMG? [Re: FiremanJG]
Cast Online   happy
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Registered: 12/14/08
Posts: 18164
Loc: North Texas - God's Country
Read closer. His berm is 4í-5í tall.
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#7179999 - 05/25/18 02:31 PM Re: Berm for .50 BMG? [Re: Cast]
TexFlip Online   content
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Registered: 08/18/12
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Loc: Chambers County
Originally Posted By: Cast
Read closer. His berm is 4í-5í tall.

I read what he wrote before I posted.

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#7180013 - 05/25/18 02:51 PM Re: Berm for .50 BMG? [Re: TexFlip]
colt45 Offline
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Registered: 08/19/06
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Loc: bastrop county
Originally Posted By: TexFlip
Might wanna go higher than 8'.
duel
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#7180074 - 05/25/18 04:06 PM Re: Berm for .50 BMG? [Re: FiremanJG]
BigPig Offline
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Registered: 08/27/09
Posts: 12317
Loc: Forney, Tx
Originally Posted By: FiremanJG
You understand it's 8 wide, 8 deep, but mot 8' tall right? It will be used at 600 yards, also. That's about how wide the current berm is.


Yes, I can read.

Why is this only at 600? Is that just the berm you want to use? What gun are they using? The Barrett barrel for AP rounds isnít very accurate. We were shooting 2 MOA and that was considered good by Barrett. Obviously, a 5 foot berm will be plenty for 2 MOA at 600.
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Originally Posted By: bill oxner
Ever spit it out rather than swallow it?

Originally Posted By: pegasaurus
Enjoy it while you can. One day you might be complaining about NOT getting random pop-ups in the morning. grin

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#7180078 - 05/25/18 04:13 PM Re: Berm for .50 BMG? [Re: FiremanJG]
TXGUNNER308 Online   content
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Registered: 12/02/09
Posts: 2709
Loc: Farmers Branch / Carrollton
JG...will this be ready for the Precision Match in July?
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