Paul, well yeah ya can. Meaning the gun will go bang. But ya really don't wanna. Not real sure the soft lead shot will damage the threads but might as it is traveling fast. Will no doubt get some lead in the threads making it harder to screw the insert in and out later and it will also blow the pattern pretty badly which is the number one reason not to do it I think. Now iffen it is fer snakes up close and personal then it might open the pattern a bit for easier kills.
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