Ballistics gel is not reliable to anyone except the bullet manufacturer's ad department. Bullets are always shot into it square and level. It is consistant thru and thru. Thus , recovered bullets are consistant and presentable.
The human or animal body is not. There's skin , flesh , fat , organs , muscle , bones , etc of varying toughness.
Back when it was pretty much standard issue to every policeman across the country , the 158gr LRN was a notoriously poor manstopper. It bored a clean hole straight thru , unless it glanced off a bone. But it loaded easy and looked good in belt loops.
As to flat pointed bullets? I guess it would be akin to getting stabbed with a pointed stick , or a blunt stick.