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PostPosted: Mon Jun 11, 2018 10:34 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8685
Location: Coalmont BC
If all those acronyms didn't get your attention, nothing will !!!!

At my suggestion, the excellent Hard Air Magazine database of Ballistics Coefficients has added two columns, containing the Sectional Density and the Form Factor of all the pellets they have tested.... Their testing was done with one LabRadar doppler chronograph, and all pellets were tested with the same gun (interchangeable barrels) at the same location (altitude), to eliminate as many variables as possible, and are calculated using the "GA" drag model, which is currently the best available for airgun pellets.... Adding the SD allows comparison between different calibers, and the FF allows you to gauge how "slippery" the pellet design is, with round nose pellets having a lower FF (and hence less drag) than wadcutters, for example.... There is a more detailed description of what these factors mean, and how they related to the BC and penetration on the introductory page to the database, which you can find here....

https://hardairmagazine.com/news/more-d ... -database/

My thanks to Stephen for adding this valuable data.... As far as I know, it is the only pellet database which displays all these numbers, and you can sort it by each column in ascending or descending order (within each caliber), for added functionality.... I will be joining the HAM team shortly with articles of a technical nature, I hope you will find them enjoyable and educational....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
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Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
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PostPosted: Mon Jun 11, 2018 3:22 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1558
Location: 1/2 Way From Ottawa and Montreal,
This is pinned worthy.

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QB79 PCP/HPA 10-50X60 Scope My 2018 FT Open


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