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It's 'keyholing ' . is the bullet jacketed ? The microgroove grooves are only half the depth of a standard rifling. Therefore the accuracy is dependent on the hardness of the lead and the diameter and match that to velocity.
If using a jacketed bullet also make sure there is no leading in the barrel.
Other than that measure the bore and bullet to see if there's a proper match.
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And Watson , bring your revolver !
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