It depends. Five rounds is useful, ten rounds is better.
Once upon a time, I plotted each shot from a particular rifle on what I called a composite target. Every shot, regardless of bullet weight or powder charge. I learned that that particular rifle shoots everything into a 4" group at 100 yards. Not bad for a hunting rifle. Many groups were much better, but it shot everything into 4 inches.
When I get ready to begin hunting and have settled on a particular rifle and load, I start shooting one-shot groups. One shot only from a cold, lightly fouled barrel. I want to know where that shot goes without doubt.
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