TN Hunter,
I set my wife up with a 20 guage TDC. It has a 27.5 inch barrel with a mod. choke tube, and vent rib. I purchased her the youth walnut Topper Jr. classic stock from H&R ($62 a set, I think) added the stock with #9 lead shot. I started her with rem 20 ga. reduced loades. I have also purchased her a cylinder and full chokes tube. She is now shooting one round of trap and one round of skeet a week. She wants to increase this to two times a week. She harvested her first squirrel about a week ago and she is starting to get ready for Turkey season. I hope this helps, for I also have a 20 ga. TDC and I love it.