is your barrel leading up??
im not THAT familiar with loading unjacketed in handguns. i do know my rifle loads have to be lubed and lead bullets should be sized after casting.
have you weighed an entire batch?? maybe your getting small airpockets or something.
if the bullets are drastically undersized as in too small diameter they will keyhole regardless of construction.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent