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If you need to determine if certain arrows are shooting out of your intended spot try marking each arrow with a number on the knock or somewhere you can easily see it and then shoot if the same arrows arent flying to your intended target it could be minsmatched spine. there can be quite a disparity of spine weight in a dozen shafts even though they are sold at a certain weight. you could also watch the grain in the shaft alignment to the Cock feather this can have an impact on accuracy also.