Velocity, bullet shape and approach angle has an effect. A .22 is round nosed with less power to penetrate the water surface at certain angles and therefore more likely to ricochet if shooting at a slight angle from the water. A .22-250 would be less likely to ricochet at the same angle due to the pointed tip as well as it possessing enough force to penetrate the water surface enough for the water to "restrain" the bullet. You can visualize displaced water as a blob trying to grab and slow the projectile. As long as the bullet is inside the body of water, it is being slowed and constrained. But if the object enters the water just briefly and re-emerges from the water surfaces it is free to do as gravity and inertia allows.
The follow figures are fictional to illustrate, with words, an example. For example a .22 shot from angle “x” makes a ½” indention in the water surface and ricochets off. A .22-250 shot from the same angle makes a 2” indention and is forced to travel into the “wall” of the water indention therefore it does not simply ricochet into air. It essentially ricochets into the body of water. The .22 might have to pass thru a ripple of water before it is freed back into air where the .22-250 did not get that same freedom because the initial force of impact created a crater in the water deep enough to truly “trap” the projectile.
I would imagine the only sound would come from a bullet toppling and whizzing thru the air. This noise is not present in all ricochet scenarios, therefore the lack of a sound is not a true indicator for the presence of a ricochet.
