Deformation bullet

The deformation bullet mushrooms on impact with the game’s body and stays mass stable in the process.
It is designed in a way that it hardly looses weight in the game’s body.
Example EVOLUTION: The effectiveness is for the main part achieved by the cross-sectional increase of the uniformly mushrooming bullet and the constant weight.
Apart from the deformation bullet there are the part fragmentation bullet and the full-jacketed bullet.