Yup, did one at Pelican Lakes Gold Course in Windsor, Colorado in July 2006, about 1000 balls from a Schweizer 300C on a 30 degree afternoon. I was on the edge of the performance envelope so maintaining RPM was critical, took off, flew a traffic pattern, went down to about 20 feet over the green and slowed it down to about 15kts, kept ETL, fed in a bit of right pedal to keep the t/r out of the way of any balls that could bounce off the skids and let the guy in the right seat tip the balls out when he was ready.
Be sure to do a ground recon of the site before you do the drop, watch out for wires in particular. For the drop itself take the duals out, get an estimate of the number of balls & do a performance plan, take another pilot or someone else with a brain with you to marshall people after you land, don't hover unless you're absolutely sure you've got the performance, set it up into the wind - all the common sense stuff...