I spent a few hours on a project like that last month. I've decided to get out of reloading hunting ammunition, so I wanted to invest a little time to find a load that patterned well out of my gun. I had 8 different rounds to test, ranging from Winchester Super Pheasant at $35/box to a few economy offerings from Federal, Winchester, and Fiocchi. Varying shot sizes as shown below. Below is a summary of the data. The yellow highlighted lines are the "lower end" offerings that were in the mix. All were shot at about 33 yards through a full choke. Range time was less than half of total time. Counting pellet holes in kraft paper is pretty monotonous, and frankly a little less objective than I expected. Cutting open shells and estimating pellet count is also pretty monotonous.
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Federal Blue Box surprised me. If I can find that shell in a 7.5, that will probably be my quail load. Variance in pellet size/count from "nominal" was also pretty surprising. The estimated counts for Win Super Pheasant and Bioammo were both 10% over nominal, ie, smaller shot. Both Fiocchi loads had estimated counted lower than nominal, ie, larger shot. Both Federal loads estimated essentially equal to nominal.
I'd like to find a Kent 1.375 load for testing. And also a Fiocchi 1.375 in #6. The thing about the Kent loads is that the 1.25 oz load claims 1345fps for velocity, but when you step up to 1.375, they step up the claimed velocity to 1475. I wonder what the commensurate increase in pressure will do to patterns.