Exterior Ballistics
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After my mind, the cone type head in combination with the small sperical tip plus the boattailed base represents the possible optimum in profile. It significantly improves the bullet length/mass ratio and additionally removes the center of gravity a little to the front. Moreover, the aluminum plug formfitting inserted into the projectile's expanding cavity among others acts as a ballistical cap and minimizes the air drag. Because of its lightweight mass the plug will not affect the bullet's spinning symmetry. Of all the different bullet constructions testfired, I found the HDB showing the highest grade self-precision by far.

The sharp-edged driving bands would not turn out unfavourable with respect to precision or velocity respectively because of their very little height of just 1/10 mm.

Compared to alloy type bullets, the HDB comes in pure copper construction giving it a remarkable better length/mass ratio, since copper has a higher specific weight than copper alloys such as tombac or brass respectively. Consequently, same mass assumed pure copper requires less volume than copper alloys do. This finally means the advantage of less total length for the HDB.