I don't know for sure what the rate-of-wist is in your barrel's rifling but I don't think it's a fast twist. So I would stick with slugs in the conventional velocity neighborhood of 1,500 fps maximum. The faster slugs (over 1,500 fps) really need a faster twist in the rifling to get them spinning and stabilized to enjoy the accuracy they like to promise.
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Uncle Matt
As long as no one got hurt!
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