Deformed shot, a lot of it "homemade" is excellent for short range shooting because of its, wider erratic patterns. My flattened #8s did fine up close early in the grouse season, but later w/ the leaves off, was lousy for the normally longer shots.
Try pass shooting for ducks w/ deformed shot....shot is round for a reason which is well known...it's aerodynamic.
Just the shot rubbing on the bbl can deform it and that's why plastic shot sleeves are used in modern shotshells for tighter, more uniform patterns....which extend the killing range.
So....up close, deformed shot of any sort, will work fine...but, for longer ranges, it's not the "stuff" to shoot......Fred