Balance and the fact they swing and move better than shorter on clay targets, would be my first thought.
I agree, but it also depends on WHICH clays game one is playing.. I don't think I'd want 32'ers on a skeet 28.. Maybe that's just me..
On sporting clays, it might depend a bit on the field layout..
Only comp gun I ever had with 32s was an SKB M700 Trap and that baby'd reach out there when the load was right.. But I'd hate to try that particular arm at a skeet range..
FWIW..
