That's the video just above my post, yeah. You'll get no JHP expansion at such distances of course - he promises to do a follow-up video testing that. But a 9mm hole through your body is a 9mm hole, whether it's at 50 yards or 440 yards. And I'd guess it would still do enough damage at 600 yards to kill if it hits something vital. Heck, CCI SV .22lr still retains 35fpe at 600 yards, and 35fpe is more than enough to get through a skull. Bullets are dangerous until they stop moving. But yeah, 10mm JHP will certainly cause more 'splatter' if that's what's wanted, and I'd agree that for some applications, such as a bear defense pistol, I'd want 10mm hardcast with a flat nose.