OP; no and no.
the barrel isn't rifled, but if it were, buckshot would not do well. The spin imparted on a single projectile by a rifled barrel keeps that projectile spinning on axis...whereas a bunch of projectiles together are all going to be spinning down the barrel around that axis, essentially taking the path of a corkscrew down the barrel...which means they will all disperse outward from that axis as soon as they leave the barrel.
Edit to add: There is no mention of Chrome anywhere on the RAA website.