littlecanoe,
Back in '96 I bought a 20ga modified choked N.W.T.F. H&R Topper Jr. Classic J.A.K.E.S. gun for my son and it will put them gobblers down hard out to 30 yards with 3" turkey loads. The full choke in your Pardner Turkey Gun should be better for turkey pattterns. Practice with light loads at first then use the heavy 3" loads for final patterning. It helps if you shoot the heavy loads for patterning to see what the maximum effective range is,then let your son shoot a couple before season. Both my son and daughter had no problem with the 3" turkey loads at age 12.
Good luck! :grin: