A thought came to my mind. Why not cast the tip from some kind of liquid epoxy?
Use cast silicone as mould and make a mold by submerge sharp tipped bullets with same contour that you will be using. When the silicone have dryed up, pull the bullet out and you have mold.
Administer proper amount o epoxy to the bottom of the cavity, and press the open tipped bullet to the mold. If the possible air or exess epoxy is problem, you could press forexample needle thru the mold. Air or exess epoxy would escape from the cavity.
When the epoxy has dried up. Pull the bullet out, and you have epoxy tipped bullet..
Any comments?
Unfortunately i dont have any silicone nor epoxy on hand to experimentjust now, but will defenitely try unless somebody else is quicker..
S