Just a thought or two-
Those 180gr lead bullets your dad bought years ago, may have age-softened over time, contributing to your leading problem. Maybe not, but maybe so.
Page 91 of my Lyman Cast Bullet Handbook has a neat tip on making a flatpoint from a round point while lubrasizing. I've not done it, but it looks pretty neat. You might give it a try with your 311291's.
My hunting season went bellyup with very little time to venture forth. How'd yours turn out?
Regards,
Sweetwater