Good advice given above.

Most open enrollment carbine training classes are 100 yards and in.

I'd use the cheapest ammo you have that runs consistently. Steel case may screw you if melted lacquer causes case sticking and induces stoppages. Don't be that guy who constantly holds everyone up to un-screw your weapon.

Handloads using pricier or premium bullets aren't needed for close-range feedback.

I'd recommend just buying a 1,000 round case of 55-grain ammo that will give you good brass for future reloads -- Fed, Winchester, PMC, IMI, Wolf Gold, Prvi, etc. Avoid Fiocchi -- their primer flash holes look like they were hand-drilled by methed-out chimpanzees on a payday weekend Friday after 1500.