Just count the holes where there was no neck split, easy way to keep track is to have a copy of the target at the table, mark a mimic of the hole after each shot and label it. This assumes you have a spotting scope and you don’t need to walk to the target to check your group.
After you have shot a dozen or so rounds, you should be able to sort the splits from the non splits. If the non splits are holding a tighter group than the splits, then you can conclude that they are contributing to the inaccuracy.
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