Interesting...
Probably would have to repeat test with both rounds and take an average of each. Maybe one or the other's performance in your one time test was a fluke.
Maybe the Fiocchi tumbled faster, lost less momentum, restabilized quicker and so penetrated farther.
If CCI spent more time in the water plowing sideways, it could have lost momentum faster and penetrated less.
If it happens every time, there must certainly be something different between the two bullets.
