Every guage has its best range of shot and powder. Depart from that and you need filler wads, crimping problems and incomplete burning on the low shot end and recoil and shot stringing on the high end. For 20ga, its 3/4 to 1 oz, and I have had enough problems with 3/4oz shot loads. You want to shoot 1/2 oz loads, get a .410. Maybe a 28ga, but I have no experience with a 28ga and 1/2oz loads.
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