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Ballistic Coefficient - Lyman Postell? (Read 1807 times)
08/21/07 at 9:46pm
Scott   Ex Member

 
Does anyone know the B.C. for the .45 cal Lyman Postall? I am trying to add the bullet to my Sierra Ballistics program so I can run some numbers based on velocity to 1000 yards, but with out a starting BC I can not rely on the answers the program provides. Thanks in advance.
 

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Reply #1 - 08/21/07 at 11:35pm

Etienne_Brule   Offline
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Quebec

Posts: 35
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Quote:
Does anyone know the B.C. for the .45 cal Lyman Postall? I am trying to add the bullet to my Sierra Ballistics program so I can run some numbers based on velocity to 1000 yards, but with out a starting BC I can not rely on the answers the program provides. Thanks in advance.


Hi,

Hope this info will give some informations.

Etienne

http://www.shilohrifle.com/forums/viewtopic.php?t=6581&view=previous&sid=0429e3e...

 

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Reply #2 - 08/22/07 at 4:38pm

Brent   Offline
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Posts: 18
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I've been searching for a BC for a friend who uses a Brooks Postell and the answer from most folks was in the 0.40 range which is quite compatible with the estimate in the thread posted above.  That is darn low, but that seems to be the consensus. 

If you wish to create estimates for yourself, you can do so if you can get the chrony data by using the following webpage.  Once you have the BC, the website will also give you methods of calculating bullet drops out to any range given a zero at any specified distance...

http://www.eskimo.com/~jbm/index.html

 

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