That's funny right there.
You should join the Old Gobbler Forum and see what guns can do
30" doesn't mean much for turkey hunting IMO, I pattern shotguns all the time.
Take a steel tape and measure 40 yards from your bbl tip and tell me how many of those no 4s you put in a 10" circle and 20" circle. I'm willing to bet it's not over 70-80 pellets max.
I have NEVER seen a #4 pattern worth a flip at a real measured 40 yards. If you killed them at 60, you simply got a lucky pellet.
Good Luck
Reloader7RM