3/4oz of 7s from my 20ga handloads or 7/8oz of RST 7s from the 16ga have been the best "killing" load for desert quail for the last 30 years. With 7.5s and 8s the numbers of these birds that bounced up and ran off was significantly higher even with heavier shot loads. But when I started using the 7s very few moved once hit. I think the penetration was enough better to cause the difference. Maybe it was just that they carried the range a little better. At any rate I prefer them.