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Thread: Ballistic coefficient

  1. #1
    Protea Benchrest (Air) Team '08/'10/'11/'13/'15

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    Default Ballistic coefficient

    With my BSA meteor which shoot the same groups with wad cutters and round nose pellets I have found that at 10m there is no difference in the group size and at 40m groups at the same place with 7.5 cm bullet drop (that is on average) The pellets that I have used is Dynamit Nobel wad cutter(7.3 grain) and Accupell round nose (7.9 grain).
    Now an interesting read from http://en.wikipedia.org/wiki/Ballistic_coefficient and http://en.wikipedia.org/wiki/Externa...cs#Pejsa_model
    I need to do more field testing.
    In my opinion I must just for get all the BC etc. and just practice more and just shoot my little BSA more accurate with the peep sights.
    Last edited by NJHS; 22-11-08 at 07:50. Reason: add more comments
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  2. #2
    Protea FT Team '10/'13

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    Interesting, how big is your "group size"?

    What pellet speed are you shooting at?

    Lower pellets speeds (as when they shoot 10m standing competition) are prefered with flat nose pellets in the region of 570 fps (where is the 10 m experts?)

    I have a old BSA Meteor mk 1 that shoots 650 fps with new spring, but with worn spring it could go down to below 600 fps which will be in the zone for flat noses, and groupings could be good.
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  3. #3
    Protea FT Team '10/'13

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    I do not know what other rifles you have but try the same experiment with 'n rifle that shoots in the region of 800 fps and compare the results.
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  4. #4
    Protea Benchrest (Air) Team '08/'10/'11/'13/'15

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    Mariuss at 40 meters average 40mm. The BSA is a MK 6 which I bought from N Yale for R750 it shoots 650 ft/sec with AA FT 8.4 grain
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  5. #5
    Protea Benchrest (Air) Team '08/'10/'11/'13/'15

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    I have 3 x AA S400, AA S200, CFX Royal (the best group with the CFX Royal at 50m was with Dynamit Nopels wad cutters of 10mm), QB36, AR 25 and the list goes on.
    I will just practice more with the BSA with the peep sights.
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  6. #6
    Protea FT Team '10/'13

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    WOW . . . do i understand correctly? 10mm groups at 50m with wad cutters ?
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  7. #7
    Protea Benchrest (Air) Team '08/'10/'11/'13/'15

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    yes only once
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  8. #8
    Springer FT World Champion '09
    Protea FT Team '19

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    I did not know that wadcutters could fly that far
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  9. #9
    Sharp Shooter

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    Ultratec Excell from my S400, cant remember the measurements but under an inch at 60 or 65m. Better than the AA fields I was using ( allthough I think they were a crap batch)

    In the words of Ripley "Believe it or not"

    There's even a better Ultratec wadcutter, Gold or something, HGS has them in stock.
    Last edited by Mac; 23-11-08 at 21:11. Reason: Spelling/poor education.
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  10. #10
    Protea Benchrest (Air) Team '08/'10/'11/'13/'15

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    The Ultratec Gold is hand sorted and very accurate in all my springers just to expensive to plink with. I use Dynamit Nobel wadcutters in my springers get it for R30 / 500 in Klersdorp
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