So what is the overall conclusion?.. that 2x 10 shot targets (20 rounds), is better than 4x 5 shot targets (20 rounds), to prove accuracy in a .22 rifle or a lot # of ammunition.
I find 5 shot groups have a couple of benefits over 10 shot groups:
1 - you get to shoot twice the amount of targets for the same round count so it's more interesting.
2 - I'm after accuracy so if I shot 3 rounds and they are not a close group I lose a bit of interest - with the slight feeling of having to 'waste' another 7 rounds on what now cannot be a great group.
But as for the idea of 2x 10 groups vs 4x 5 groups for accuracy proof... I'm uncertain.
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