I just found that out shooting at one at home in my living room, but at the outdoor range it is quite OK
I dont really measure CTC or groups, i just like them to be small enough, and that i generally gauge from how many of the holes touch each other, CUZ it is quite rare i get 2 slugs in the same hole with the distances i shoot.
My fellow Randusian ( name for people living in the Danish town of Randers ) Viking airgunner he shoot at marker dots made on the back of regular paper targets.
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