I really like the Super Colibri ammo. I'm not using it because its quiet, gun shots don't mean much out here in the county, seems like somebody is shooting something all year long. These do just sorta sound like a loud hand clap, not very loud. I like them for the penetration or to be more precise, the lack of it.
My deck to the ridge line of my garage is 50 feet. My Beretta's red dot, (cheapie!) is sighted in at 50 feet. These rounds have a trajectory about like a brick out of a sling-shot. As long as I stay at my sighted distance the critters are toast. I kill mainly pigeons, starlings & crows, on a breast shot the bullet goes in but never exits the target, instant kill and I don't need to worry about screwing up my roof shingles.
Never tried them in a rifle, out of a hand gun, at a pre-targeted distance they work real fine for me. They won't cycle the action but in the NEOS they feed from the magazine great. Ken