Max,
A lot of trap shooters have far too fragile psyches to have anyone shooting adjacent to them that might disturb their game (ie: give them an excuse for their poor shooting). I love shooting clays, but don't much bother shooting trap anymore because of such anality among the trap shooter fraternity.
Seriously, if you don't want to get bitched at, use your #4's away from the trap range.
Steve

Approach life like you do a yellow light - RUN IT! (Gail T.)