I only use sub-sonics in my centrefire when poaching on Snake Island.

Absolutely a JOKE only !!! Gryphon may get the "joke". I do know someone who got caught with a barrel "extension" coming off the island, but many years ago ...

More seriously I have bought a whole bunch of different ammo for my .22 RF from HV to sub-sonics. To try out to find the "sweetist" shooting ammo. My old ammo has run out and no longer available.

Have never tried centrefire sub-sonic loads.