Some ammo brands have the powder loads optimized for short barrels. And some bullet makers produce bullets that are designed to perform at lower velocities.

Ammo makers have cartridges that have both aspects. Speer makes 'Gold Dot Short Barrel' ammo as well as separate bullets for reloading and they have short barrel bullet/powder combinations in their reloading manual.

Oh, and is it adequate? Well you ain't trying it out on me!