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For some time I have expressed that it appears that Permanant Wound Channel was based on Meplat and Velocity and Penetration was based on Weight and Velocity. The "weight" is incorrect! I should have said Sectional Denisty instead of weight. As you know Sectional Density is the ratio of weight to the area of the cross section of the bullet. Therefore a lesser caliber bullet with the same Sectional Density as a larger caliber bullet (and the same nose shape) will penetrate the same if the Velocity is the same. Sorry about that! Best Regards, James