I reacentley bougth a 870 express slug


Whith the gun i recived a super full choke but I think its to tight to shoot slugs with?
Is there anyone who can post or direct me to a guide for chokes?
What choke you shuld use for different loads,slugs,00 buckshots etc.
What kind of chokes do you use in your HD shotguns for example.
Im thankfull for any answers.
Best regards/FA