How true , I did know that about barrel tuners and the like shooting 22lr benchrest. Last week received a cheap Aliexpress chrony to replace old green shooting chrony that won’t work inside. Been shooting with that. So it was warm enough to go out today to my 33 yard range . Had the barrel chrony on . I’m trying to remember from 2 hours ago but it was an inch high.That chrony on the end of the barrel can change POI and group size too. You should test group sizes without it.
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