American clay target sports were first developed to sharpen the skills of wing shooters, and more specifically upland hunters. So, when it comes to selecting ammo for shooting upland birds (the ones approximately the size of clay targets), it should be no surprise that target loads perform well. When it comes to dove and quail, most clay shooters don't have to think twice about selecting ammo -- they just grab an assortment target loads in 7-1/2s to 9s in various gauges and head out. When they get to the where the birds are, then then make their gun/ammo selection based on the current conditions.
Local store had size 8 for less…
Some of the newer shooters may not be aware that not all shot shells are created equally. Those discount "field" and "dove and quail" loads may be attractively priced, but you need to know what you're getting. The quality of the shot and other components may be significantly inferior to those used in premium loads. I've seen discount loads opened up and the shot wasn't as uniform as reclaimed (the pre-shot stuff the gun club recycles). When you look at all the costs involved in a hunting trip, trying to save a few dollars in ammo costs is being penny wise and pound foolish. I much prefer quality reloads to discount hunting loads. And, for the cost conscious, the reloads are cheaper.