TEXASLAWMAN
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For the last few weeks I have been testing the new hunting bullets from www.cavitybackbullets.com in particular their 6.8 120 MKZ. Just as the thread title says MKZ stands for maximum kill zone these bullets are designed to expand up to 2.5 times the caliber, at a very wide velocity range from 2800 fps to 1400 fps.
The MKZ bullets are solid copper monolithic bullets. As we know copper weighs less than lead, so a copper bullet the same weight and caliber must be longer than the same weight and caliber lead bullet. A longer bullet leaves less room for power in the case limiting the weight of most copper bullet designs, but the "Cavity Back" bullets as the name suggest have a cavity in the rear of the bullet. This cavity allows more room for powder, with the 6.8spc 120MKZ I was able to use the same powder charge as the 120gr SST with no powder compression.
At the time of writing this report I have taken 26 feral hogs with the 120 MKZ. While this is a small sample the results have been positive, and consistent enough for me to feel comfortable releasing this report. Ranges have been from 40 yards to 150 yards, no recovered bullets yet all completely passed through. Exit wounds all have a triangular shape and average between 1/2 inch to 1 inch in diameter, producing massive amounts of blood loss. Some copper bullets tested in the past did very well when hitting solid mass like muscle and bone but would zip right through if you missed the mark and hit soft tissue farther back back. So far the MKZ has not experienced this problem and seems to expand and transfer energy to the target regardless of hitting soft or solid tissues, knocking down running hogs even with bad shot placement center gut shots.
Here are a few graphic pics below showing the typical MKZ exit wound.