The SSS 60-grain stuff is great stuff - very accurate and pleasant to shoot, as well as consistent in velocity. Problem is that velocities are really low.
Really low from a short-barreled handgun of the type Ultraman has displayed in his (very nice) photo above.
I'd be concerned that, even with the amazing sectional density these have, they just wouldn't penetrate a skull if needed at the velocities delivered.
Certainly underscores the importance of chrono'ing ammo from
your gun.