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Which barrel?
The newer riot gun barrels have the bead on a little ramp, rather than sitting on the tube. This was done to lower the POI/POA issue that you're describing with slugs. If you're experiencing this with one of these later barrels, something's fishy.
On the other hand, maybe it's how you're mounting the SG? Are the slugs and buck hitting basically the same point of impact?
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