As small as I go is 8 shot on Quail or Dove's only in sub gauges in loads under 1oz. If I am using a 20ga or 12ga and 1oz or more shot I prefer 7 1/2 shot.
For grouse, partridge and woodcock I use 7 1/2, better in the woods and if I hit them it has a better chance of killing them cleanly. For pheasant I use #6 copper plated as the birds I shoot are pen raised.
In 1973 and 1974 we shot almost all 9 shot. It's what we had to reload.
I never really noticed any difference in kills between the 9, 7-1/2 or 8.
But I thought I noticed a difference later on between 7-1/2 1-1/8 ounce and 8 shot 1 ounce loads.
Heck, I have used 7/8 oz. #9 for early season ducks (canada didn't go to steel until 2000). and more recently #7 steel (7/8oz). up here it's not hard to get some pretty close shots early in the season.
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