Pennsylvania Shotgun Shooting Organizations:
Skeet:
https://www.pssa.com/
Sporting Clays:
http://www.pasportingclays.com/
Trap:
https://www.pssashotgunning.org/
National: NSSA/NSCA:
http://nssa-nsca.org/
ATA:
https://shootata.com/
Scholastic Clay Target Program:
https://mysctp.com/