Guess all those SD pheasants I shot with 1oz 20ga standard velocity loads of 5s and 6s from my Parker 20ga must have been just an accident. If I were going to tinker with different loads for the second barrel it would be to use 6s in the more open barrel and 5s for the longer shots. When using my 16ga 100 year old light wt German made gun RST 7/8oz loads seemed to be just fine for them as well.