I have played with that aguila sss as well as colibri .22 ammo. Interesting thing, I shot at a hardwood 4X4 from close range with the sss and compaired with remington yellow jacket (I think that is what it was), the slow but heavy 60 gr. sss ammo penetrated about 3X deeper than the standard yellow jacket stuff. I didnt find its accuracy to be all that great though out in the gravel pit (shot from my 10/22 target model),and it seemed you could hear some inconsistency now and then in the sound of the report. The colibri and super colibri stuff was damn quiet when dropped by hand into the 10/22, but accuracy was pretty bad. Unacceptable really. I wonder if it would be better in a different rifle, different twist, etc... Fun stuff to play with though.