Really? But all the crossections of API rounds have it like that. Or is there actually a thin jacket of lead around the core that I am not seeing here?
http://www.ar15.com/ammo/project/ammo_c ... I_APT1.jpg
Also I do have a bit more burny stuff so that my core does not actually touch the jacket. Is that a problem too?
I based my load off the 2nd from the left in that picture.