New Posts New Posts RSS Feed - How did  .308 military sight-in calc?
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

How did .308 military sight-in calc?

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2006 at 14:53
ba_50 View Drop Down
Optics Apprentice
Optics Apprentice


Joined: December/02/2004
Location: Illinois
Status: Offline
Points: 150

I got to wondering how the military came up with a standard sight in chart for the .308. Did they do it from a benchrest, prone, or just compute them?

 

It is difficult to get the same POI from different postions, and each shooter usually hits a little different.

 

I know that the Unertl tactical has a cam for the sniper round. So how did they set that up?

 

Seems like an interesting topic to me.

 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2006 at 13:19
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087
It was stolen by the NSA, reviewed by the Pentagon, appropriated by Congress, reviewed by the GOA, implemented by the Forest service, redirected back to the Park service, reassigned to FEMA where it is currently be reviewed for eligbility.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2006 at 20:53
Mike McDonald View Drop Down
Optics Journeyman
Optics Journeyman


Joined: September/01/2004
Status: Offline
Points: 734

   I got to wondering how the military came up with a standard sight in chart for the .308. Did they do it from a benchrest, prone, or just compute them?


The folks at Aberdeen modeled it based on the requirements of the specific weapons it would be used in, had a whole bunch made to that spec, then a bunch of civilians and military  shot a whole lot of it and conformed the model.


  It is difficult to get the same POI from different postions, and each shooter usually hits a little different.

Not really.  Good shooting is consistant shooting regardless of positions used.  This is why we practice at every opportunity.
A shooter with a consistant weapon  and optic and a good zero will hit the same spot as any other good shooter given the aforementioned criteria.

 I know that the Unertl tactical has a cam for the sniper round. So how did they set that up?

See item 1 above.

Leupold has the same item.  I have several for my ammunition, each altitude and temperature specific.

As to how to do that, refer to  "shot a whole lot of it", which makes things very simple.

Know your rifle, know your weather, and know your ammunition.  The rest is gravity.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/22/2006 at 07:50
ba_50 View Drop Down
Optics Apprentice
Optics Apprentice


Joined: December/02/2004
Location: Illinois
Status: Offline
Points: 150

Mike,

 

So it was a bunch of trial and error practical testing. That's good.

 

Are you saying that some components can be changed in the Unertl and Leupold?

 

I assume you are also saying that shooting off sandbags should get the same POI as prone, sitting, sling, non-sling, etc. if you get the same sight picture and letoff each time you shoot?

 

Thanks.  Bob

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/22/2006 at 13:43
Mike McDonald View Drop Down
Optics Journeyman
Optics Journeyman


Joined: September/01/2004
Status: Offline
Points: 734
So it was a bunch of trial and error practical testing

No, it was engineered design and field confirmation.  There's a difference.

Are you saying that some components can be changed in the Unertl and Leupold?

The Unertl is a custom scope that has no facility to interchange BDC turret caps.  It did have the ability to make both major and minor elevation adjustments, and the users recorded this data for a particular rifle and environment and made corrections accordingly.

The Leupold MkIV and the USO series scopes with BDC caps  have the ability to field interchange ballistics data.

  I assume you are also saying that shooting off sandbags should get the same POI as prone, sitting, sling, non-sling, etc. if you get the same sight picture and letoff each time you shoot?

Depends on whether or not it's me doing the shooting 



Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/22/2006 at 13:57
Urimaginaryfrnd View Drop Down
MODERATOR
MODERATOR
Avatar
Resident Redneck

Joined: June/20/2005
Location: Iowa
Status: Offline
Points: 13868

.... and then there is------- WIND------------>

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/23/2006 at 14:09
Steelbenz View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar
ROLL TIDE ROLL

Joined: January/03/2006
Location: Heart of Dixie
Status: Offline
Points: 4900

If every thing is the same, your POI should not change with whatever position you are shooting from. be it a bench or prone. Cheek weld and where your eye is in relation to the center of the scope is what matters. If you have a poor set up then your POI will be moving even if you move from bench to bench. Repeat every detail of your last shot, Every time, and your POI will be the same. "IF" all else is the same. That is a big if, Wind, factory loads, different batches of ammo. The angle your shooting from, all of this matters as to where your bullet will land. Thats why you should shoot often, and drill yourself so you do the same routine over and over until its like breathing. If your going to have to shoot from all angles Practice from all angles. Thats the only way to become good at this, Practice and trigger time.   

 

 AND remember my little saying below!  



Edited by Steelbenz
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/28/2006 at 22:08
Mike McDonald View Drop Down
Optics Journeyman
Optics Journeyman


Joined: September/01/2004
Status: Offline
Points: 734
Benz,  your bio says automation specialist.
Same here.  Who ya doing business for?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/29/2006 at 16:59
Steelbenz View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar
ROLL TIDE ROLL

Joined: January/03/2006
Location: Heart of Dixie
Status: Offline
Points: 4900

Mercedes Benz in Vance,

Paint Shop robots

 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "How did .308 military sight-in calc?"
Subject Author Forum Replies Last Post
1 Piece Scope Mounts on .308 Bolt Hollywood58 Rifle Scopes 3
AR platform .308? Alan Robertson Firearms 14
scope for new Savage 10T .308 Win? 2ndtimer Tactical Scopes 4
DPMS AP4 .308 scope and mounting opinion?? tcoche Rifle Scopes 4
.308 & Scope Please HELP philip393 Rifle Scopes 47
.223 6.8 .308 compared Urimaginaryfrnd Reloading & Ballistics 10
AI .308 Mags supertool73 Firearms 16
Scope for Savage 10 .308 dk1975 Rifle Scopes 11
Mossberg 100ATR .308 woodyth Rifle Scopes 7
Help with Optic for Tikka Master Sporter in .308 Smileydawg1 Rifle Scopes 12


This page was generated in 0.312 seconds.