One can load up pretty much any bird to fly at 900 fps. OOTB that speed is more of a 380ACP speed, but you are correct. These folks have access to many resources and choices.
"I want an 8.6 BLK round that will walk across the yard really slowly and smile at the pretty girls while also making not a sound".
Possibly a .380ACP, at that speed. Or a subsonic 9mm (but that would be slooooowwwww) or 45ACP.
Plenty of subsonic 9mm loads show less than 900fps (in the gun tests you can find in plenty of gun magazines, for instance). Same for most .45 loads.
Yep. Entirely poss.
One can load up pretty much any bird to fly at 900 fps. OOTB that speed is more of a 380ACP speed, but you are correct. These folks have access to many resources and choices.
"I want an 8.6 BLK round that will walk across the yard really slowly and smile at the pretty girls while also making not a sound".
Yup. We can do that.