Just to clarify and elaborate,
I have filmed and heard the ricochet sounds, but only from 50 cal guns on my six oclock. 20mm's (and larger I suppose) don’t ricochet. So, yes 50 cal bullets do "bounce off" at a distance of 200-600 yards from a dead six o’clock attack but not 20mm’s.
I believe the plane hit area changes as well from the front to the back. I see a lot more rounds passing when fired upon (from the six) by cannon equipped planes. A bit of stick stirring (which I was not doing when confirming some of the six o’clock deflections effect) can really keep cannon fire off you. Not so in a HO.
Looks to me like two effects are combined when attacking from the six o’clock, the ricochet and the smaller hit area. Flying a 20mm cannon equipped plane eliminates one of these effects.
Regards,
Malta