Slugs in a regular FX barrel

 You can try. Usually not recommended.

You can try. Usually not recommended.

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Why is it not recommended? There is no harm in shooting slugs out of a pellet barrel. Worst it will do it not shoot accurate as pellet. 

The FX STX barrels are better about shooting slugs .

The slugs have a better chance of being inconsistent in the accuracy it should not me harmful to your gun.

Make sure that the slugs are swaged to .217-.218 range, else they will get stuck in the barrel. Most guns get damaged while trying to eject the stuck projectile with a metal rod. You can shoot slugs but dont expect less than half inch groups.

Check this post

https://www.airgunnation.com/topic/test-results-after-600-slugs-shooted-022-cal-600-mm-slug-liner-on-my-x