darkgael, before the mid 1980's, the best rimfire match ammo easily shot that well at 100 yards. Most of the smallbore prone records set before then still stand. But that's just one 10-shot group.
After the disaster at Eley's plant in England at that time, priming mixtures got changed and no ammo made since then's shot better than 3/4 inch at 100 yards. But, as usual, once in a great while 10 rounds of current ammo will shoot under 1/2 inch at 100 yards. Accuracy's best defined as the size of the group were all shots fired go; not just the smallest ones with a few holes.
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