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Overbore?

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  #1  
Unread 09-28-2003, 08:10 AM
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Join Date: Feb 2003
Location: memphis, tn
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Overbore?

Is there a formula that can be used to quantify the degree a catridge is "overbore"?

Thank you
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  •   #2  
    Unread 09-28-2003, 10:20 AM
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    Location: Long Island, New York
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    Re: Overbore?

    Here is my formula:

    If the largest safe charge of the slowest practical powder, in a given cartridge, does not fill the case to the bottom of the neck, than it is OVERBORED. [img]images/icons/grin.gif[/img]
    VH
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      #3  
    Unread 09-28-2003, 10:45 AM
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    Re: Overbore?

    commun formula is V = 1000 dē

    but shape of case can make difference short fat case with sharp shoulder are more efficient ex :

    6 Norma BR compare to 243 WIN
    22 Dasher comapre to 22.250 Rem

    basic idea is when you reach max water capacity for one caliber exemple 70 grain of water in 6.5 cal if you go over your gain in velocity became low compareto the increase of powder volume and if you go to extreme you sometime lose velocity or burn powder for nothing
    exemple :
    7 STW and 7/378 Wea

    so except for fun or fashion better to use a longer barrel than a hudge quantity of powder and avoid by this fact carbon fouling effect wich is very commun with real overbore cartridge

    good shooting

    DAN TEC
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      #4  
    Unread 09-28-2003, 12:20 PM
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    Re: Overbore?

    DAN TEC

    re commun formula is V = 1000 dē

    Does "V" = Velocity?
    What does "d" represent?

    Also can you give me an example formula for a .308 Winchester load vs. a 300 Ultra Mag? It seems that there should be some logic about the term that can be quantified.
    Thanks
    Howard
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      #5  
    Unread 09-28-2003, 12:52 PM
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    Re: Overbore?

    v is volume in grain
    d is bullet diamter in inch

    good shooting

    DAN TEC
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