It happens with plastic wads reasonably often. When you have wads blasting thru a 30yd target, that is usually the cause. Have seen that in various brands from time to time. And then the word will get around, there is a bad batch of wads out in those rounds. I don't really have any knowledge on it, but, it may be that some are meant for low vel target rounds and there is a maybe a speed threshold that will cause them to stick like that, or perhaps they are just improperly processed and wind up too soft.
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