I struggled with DTL so Olympic trap was just way too much!
I've only ever shot 12 bore so cannot comment really. I don't know anyone who shoots clays with a 20 bore. Can't imagine it would be very easy!
Now things have settled down a bit with my house move move i might get back into it again. I always fancied one of those multi coloured Berettas. Can't remember if it was a 686E though.