I have a whole flat of RST 2-1/2" 1 oz. copper plated #6's. However, the first two days will be push & block hunts with birds probably at longer ranges. I don't feel compelled to use bigger loads but am weighing my options especially with second barrel loads.
The gun I'm using is in excellent condition and the wood is not oil soaked in the least. As a matter of fact, it is perfect. I'm more concerned with metal issues.
The last three days will be walk-up hunting with good dogs.
Incidentally, I've killed a lot more roosters in MT than I ever have in SD and usually with a 20 gauge.