Hello Andros, RST shells are great (Classic Shotshell Co.). I like using the 1 oz. non-toxic loads for ducks which have a 1200 fps. rating. I shoot their target loads (7/8 oz.) at the same speed so the switch to duck loads allows for the same lead.
Good luck hunting and hope you enjoy your Parker. I got my first one last year and love shooting with it.
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