When metallic cartrage reloading first became popular, there were lots of folks who tried to "make it better" by using higher pressure propellants and light weight projectiles in their ammunition.
Those who were meticulous in record keeping and measurement of arm and fired cases escaped serious injury. However, they invariably destroyed their firearms (prematurely wore them out from flame etching throats or pounded bolt lugs into submission) if they were lucky.
If they weren't lucky, they had a trip to the hospital.
No, I don't bungee jump either.