Delta Wolf HP .22 It's ready to shoot slugs or I need a special barrel?

[AlejandroSanchezVazquez]

Hello,

I have a Delta Wolf HP .22 and I don’t know if It’s capable of shooting slugs?
What is the meaning of 15.89gr-2b and 15.89gr-6b in the gauge selection in FACTORY SETTINGS? (2b and 6b) are unknown terms...

Kind Regards,
Alejandro