I shoot a 3.5 full choked pump gun and would not shoot anything less than #4’s. I tried 5’s for a few years and had two bad experiences. Switched back to 4’s and haven’t had a problem since. You will thank the extra knockdown power when your tom hangs up at 50 yards and won’t come a step further.
One thing that I think is important is to pattern your gun to know how to compensate your aim. Example, if you pattern high, aim a little lower to compensate. Once shells become more available, you can find the one that patterns best with your gun. Winchester seems to be my guns favorite
