Ogive Radius

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Ogive Radius

     The term Ogive Radius is used to describe the curved portion of the bullet nose. It is the radius of the curve of the nose defined in caliber lengths.

     Three measurements are required to define the curve radius length.
1. The length of the curved portion of the nose = NL

2. The diameter of the nose where the curved portion begins = D

3. The diameter of the tip or meplate, whether rounded or flat, = T

     The length, L, in inches, of the curve radius may be calculated by the following function.

     L = ( NL * NL ) / ( D - T ) + ( D - T ) /4

     Substituting the measurements of the Lyman 454190 into the equation, we have:

    L = ( 0.396 * 0.396 ) / ( 0.454 - 0.200 ) + ( 0.454 - 0.200 ) / 4

    L = 0.156816 / 0.254 + 0.254 / 4

    L = 0.68106" = the length of the radius of the curve in inches.

    Divide the curve radius in inches by the diameter of the nose to determine the Radius of the Ogive in Nose Calibers.

      0.68106 / 0.454 = 1.5 or an Ogive Radius of 1 & 1/2 Calibers.