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ballistic coefficients?

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  #15  
Unread 07-17-2003, 05:27 PM
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Re: ballistic coefficients?

Thanks Darryl.
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  •   #16  
    Unread 07-17-2003, 05:53 PM
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    Re: ballistic coefficients?

    I am shooting the Hornady .224 75gr A-Max from my 22-243AI. The listed BC is .435 (if I remember correctly). When checking the actual bullet drop, the BC looks as if it should be .600.
    Can not explain this but am not complaining either.
    VH
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      #17  
    Unread 07-17-2003, 11:24 PM
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    Re: ballistic coefficients?

    Could someone tell me the legnth of the 240 gr MK?
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      #18  
    Unread 07-18-2003, 12:05 PM
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    Re: ballistic coefficients?

    Varmint hunter, we share the same "concern" with Hornady poly tipped bullets. When shooting the 165gr SST in my 30 cal rifles, I was getting drops which worked out to 0.6 or higher. Didn't make a lot of sense but the scope adjustments don't lie.

    A nice concern to have...I just hope that hornady starts making heavier Amax in 30 cal.

    My new project is a 6.5 and I will be using 140gr SST bullets. These bullets measure just under 1 1/2" long. Compared to other 6.5, 7mm and 30 bullets, only the 240gr MK is longer. The BC of these bullets is going to be very high. I expect that it will be higher then 0.625. Same length as the 7mm 162gr SST which are listed at 0.625.

    Jerry
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      #19  
    Unread 08-24-2003, 07:55 AM
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    Re: ballistic coefficients?

    Question...

    135gr sierra match I have listed at .435bc, which seems to be about right for drop at the velocity I have been shooting out to 500yds.

    I just was given a couple boxes of 135gr sst's and was wondering if anyone has a BC for those bullets in .277caliber. I'll be pushing them around 2900fps.

    What are some of the higher bc bullets in the .277 catagory?
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      #20  
    Unread 08-24-2003, 08:10 AM
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    Re: ballistic coefficients?

    Steve

    135 Gr Sierra MK----.488
    140 gr Sierra GK----.479
    140 Gr Hornady SP---.486
    150 Gr Sierra GK----.497

    I don't have the one you asked about though.

    All the above BCs listed are from the Oehler program.

    Later
    DC [img]images/icons/smile.gif[/img]

    [ 08-24-2003: Message edited by: Darryl Cassel ]
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      #21  
    Unread 08-24-2003, 08:20 AM
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    Re: ballistic coefficients?

    I pass this on for reference only, not as my opinion. Short time back Rick Jamison wrote in his column in ST that he'd a similar experience while evaluating Swift Sciroccos with his Oehler 43, specifically, the actual BC was much higher than what Swift had claimed. He reported that subsequent discussion with one or more ballistic gurus from someplace revealed that the nose profiles common with many secant ogive and vld profiles do not work well with existing ballistic programs, this likely due to the fact that they do not have adequate form or shape data for comparison. Based on his shooting the COMPARITIVE BC for whatever Scirocco bullet he was shooting was near 1.0.

    I don't quite believe everything I read, or everything that comes out of a computer. [img]images/icons/wink.gif[/img] They are sleek bullets however.
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