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Chamber mates for shotguns

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Has anyone ever tried the chamber mates you put in your 12ga to be able to shoot smaller shells? I was thinking of getting some 28 ga for my 12. They say they are for O/U and side by sides but would they work in a pump if you Just shoot 1 shot at a time then put it back? does anyone think it will hurt your gun? Would the pattern be really bad because the bore is so big? Any advise before I buy these? Thanks
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