I don't think it matters if you shoot 2 10 shots, 4 5 shots or whatever, as long as your shooting enough rounds to know what the rifles actually doing. I've been mislead by too many small groups to make this mistake anymore.
If you shoot 5 5s, and don't change your body position, then if you have one group that's slightly left, one slightly right etc, the capability of the rifle is both of those groups overlaid.
With smaller round count groups you don't shoot out your point of aim as much.
For hunting or long range, I think its also important to shoot groups at the max distance (or close) you'll shoot, that way you'll know how if performs there too.
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