Can I shoot slugs out of my Ataman M2?

I am wondering if I can shoot slugs out of my .25 cal Ataman M2. Its rated at 980 FPS with 55 foot pounds. Here is the barrel data:  

• Barrel data (diameter, number of grooves, choke, twist): 15mm/12/choked/450mm/1:18

Also, I don't really understand if slugs are good out of choke barrels or unchoked barrels...and why. ...If anyone cares to explain that to me and the rest of the class. 

Thanks! -Nate 

My new Ataman M2 Ergonomic Stock (Limited Edition Jatoba Wood)