swampcolie nailed it...

i believe i have the same gun as you just bought...21" barrel and had an extended remington extra full choke in it...

put a Undertaker Hevishot choke tube in it....boy what a world of difference. started throwing all turkey loads great...i tried like 4 or 5 different loads and they all patterned 1000% better and would all do more than well to put down a bird farther than i will shoot at one...

definently play around with different loads and chokes...funny what a difference a 20$ choke tube made