That may be true with 40 grain ammo, but there's nothing here that says they were using 40 over 36.But the vast majority of standard velocity cartridges from any manufacturer will be subsonic out of most guns and most atmospheric conditions. You have to have just the right ammo,just the right gun/barrel length and just the right atmospheric conditions to go supersonic.
1200fps Federal is clearly super.
My only point is that the stated standard velocity ammo used is not necessarily subsonic, and I have proven it. Feel free to argue amongst yourselves.