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Target Shooting Matches, Discussion & Events => The Long Range Club => Topic started by: Tims229 on December 04, 2016, 12:36:10 AM

Title: Pellet ballistic information
Post by: Tims229 on December 04, 2016, 12:36:10 AM

Could anyone tell me if ballistic information is available for pellets? I haven't been able to find any information. Does anyone have this type of information? Or at least know where I could find it.  Thanks!

Edit***I'm referring to ballistic coefficient.

Title: Re: Pellet ballistic information
Post by: rsterne on December 04, 2016, 01:09:59 AM

ChairGun has a built in database with lots of BCs.... They are a good starting point, but since BC varies with velocity, and even to some degree with the barrel a pellet is fired from, it is only a guide....

Bob

Title: Re: Pellet ballistic information
Post by: Tims229 on December 04, 2016, 09:31:40 AM

Thank you Bob. I'm mostly just looking for general BC to load into the X site when I get it. Interested to see how accurate it'll be with auto compensation.

Title: Re: Pellet ballistic information
Post by: rsterne on December 04, 2016, 02:07:52 PM

Here is some very OLD data I measured myself, you can take it for what it's worth....

(http://i378.photobucket.com/albums/oo221/rsterne/Important/Web177PALBalCoef.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/Web177PALBalCoef.jpg.html)


(http://i378.photobucket.com/albums/oo221/rsterne/Important/WebPALBalCoef.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/WebPALBalCoef.jpg.html)

If you need similar charts for under 500 fps velocities, I have those as well.... There are SIGNIFICANT differences....

Bob

Title: Re: Pellet ballistic information
Post by: Tims229 on December 04, 2016, 02:24:33 PM

Very much appreciated. It should get me in the ballpark. Much more information than I could find anywhere else. I know the BC changes with velocity, but these are good starting points. Thanks again!

Title: Re: Pellet ballistic information
Post by: rsterne on December 04, 2016, 02:47:37 PM

Here are a few more .177 at higher velocity....

(http://i378.photobucket.com/albums/oo221/rsterne/Important/177BallisticsCoefficents_zps3ef7a407.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/177BallisticsCoefficents_zps3ef7a407.jpg.html)

Roundball (calculated)....

(http://i378.photobucket.com/albums/oo221/rsterne/Important/LeadBalls-1_zps951918a6.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/LeadBalls-1_zps951918a6.jpg.html)

Some .25 cal....

(http://i378.photobucket.com/albums/oo221/rsterne/Important/25calBallisticsCoefficients.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/25calBallisticsCoefficients.jpg.html)

I also have some data that indicates that the JSB 25.4 gr. Kings have a BC about 0.034-0.037 and the 34 gr. Heavies are about 0.050-0.053.... no velocities given, but would be slower than the above chart for the Kings....

Bob

Title: Re: Pellet ballistic information
Post by: Tims229 on December 04, 2016, 03:10:11 PM

Great stuff Bob, thanks again! Apparently you have put some effort into this. I thank you for sharing and also for what you have contributed to this sport we all love.

Title: Re: Pellet ballistic information
Post by: Ridge Runner on December 05, 2016, 06:27:23 AM

Dang!  My wife thinks I am obsessed with my air rifles.