http://www.accuratemolds.com/bullet_...=45-295P-D.png
That's not a bore riding nose, that is full diameter. What do you suppose is the purpose?
Sit in the throat of a revolver for a perfect launch?
Stabilize the front of the boolit like shooting a straight cylinder without excessive driving band?
Black powder shooting, with a fat grease groove that sits outside the case?
Something else?
What do you think?