Thing I find interesting is the deformation of the FX slugs, the pics in post #52 at 28fpe echo the deformation AAR got at 40m in .22 at 38fpe
Yet when I shot the .25 at similar range I got practically zero deformation from 42fpe

I'd like to see tests of the .25 with a bit more power at 40-50yds in to gel, to see if they need more velocity to expand,
or whether they're just a bit too thick where the .22 is the perfect thickness to turn inside out & therefore transfer all it's impact energy.