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What is the Ballistic Coefficient of Predator Polymag 0.30?  

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MASSHOLE_AIRGUN_MILITIA
(@masshole_airgun_militia)
Joined: 4 weeks ago
Posts: 12
2019-11-12 22:52:34  

What is the Ballistic Coefficient of Predator Polymag 0.30?


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Citizen K
(@citizen-k)
Administrator
Joined: 2 years ago
Posts: 418
2019-11-16 02:19:27  

@masshole_airgun_militia

Predator Polymag 44.75 Grain pellets. Ballistic Coefficient 0.025

According to:

Ballistic Coefficients

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MASSHOLE_AIRGUN_MILITIA
(@masshole_airgun_militia)
Joined: 4 weeks ago
Posts: 12
2019-11-17 21:23:31  

@citizen-k

Thank you for replying but you could have simply replied I don't know.

If you wanted more details you could have requested for it.


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MASSHOLE_AIRGUN_MILITIA
(@masshole_airgun_militia)
Joined: 4 weeks ago
Posts: 12
2019-11-17 21:57:02  

I am shooting Polymag 0.30 out of Hatsan Mod130S approximately 590ft/s.


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Miles_M
(@miles_m)
Joined: 2 years ago
Posts: 36
2019-11-19 14:42:54  
Posted by: @masshole_airgun_militia

I am shooting Polymag 0.30 out of Hatsan Mod130S approximately 590ft/s.

If the BC is based on the correct reference drag law the velocity of the pellet is irrelevant. It is only when the wrong reference drag law is being used that the BC changes with speed. Unfortunately many of the BCs published in the past have been produced by people who appear not to know what they are talking about using entirely the wrong reference drag law and this has led to the myth that BC changes with speed. It is OK and understandable if enthusiasts producing their own BCs make this basic mistake especially after what they have been told so often but, when those claiming to be experts make the same basic errors and publish the results without explaining what they have done and why they have done it, it is not really acceptable. BC should not change with speed or range, this assumption being the whole basis of the origins of the BC method of calculation and the reason for its eventual downfall in ballistic calculation.
I do not know what reference drag law the BC quoted above is based on but if it is the GA drag law from Chairgun then it is entirely the wrong reference drag law for a pellet of this shape and should be used with extreme caution. The GL drag law is possibly the nearest available in Chairgun.

 

Don't believe anything you read on the internet. Assuming you can believe this of course.


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