Thread: Theory of reloading for short barrels

If we shorten from say 22in to 16in do we try to avoid burning leftover powder as muzzle blast or inside the suppressor by simply reducing powder weight (eg rechamber from 300WM to 308) ?

Or do we go to a faster powder so it all burns in a shorter length ?

Do we use a heavier bullet to extract the most energy by holding the burning powder in the barrel as long as possible or do we use a lighter one in hope of retrieving some velocity ?