Meplat

Meplat, from a French term for a flat surface, is the technical term for the flat or open tip on the nose of a bullet. The shape of the meplat is important in determining how the bullet moves through the air. In particular the size and shape of the meplat has a significant effect on the ballistic coefficient of a bullet. If the meplats on a group ...
Found on http://en.wikipedia.org/wiki/Meplat

Meplat

Meplat is the name given to the flat area at the front of a bullet. It can be tiny; pointed full metal jacket bullets actually have a tiny flat area at the front. On the other hand it can be quite distinct. Lead pistol and target rounds often have a large meplat to help them punch a distinct, neat hole in the target.
Found on http://www.riflesintheuk.com/glossary.htm
No exact match found