The word meplat is a term used in ballistics terminology that has survived from a bygone era. The word itself is a french noun which means 'the flat of' and in ballistics it refers to the tip of a projectile. Meplat is not an adjective, it does not describe the shape of the tip or diameter in any way. Our current term could easily have been 'tip' or 'point' or even 'Fred' but instead, ballistic engineers of the world use the word meplat. The French were very much at the cutting edge of ballistics during the 19th century and the word meplat has survived out of an unconcious respect for these eary pioneers. The term mostly likely stems from the days when all conical projectiles had flat points. The front was therefore called the flat and the rear dubbed the heel. Nevertheless, do not be confused, the word meplat simply means 'tip' in today's terms.

As most will guess, the shape of the meplat (tip) has a great effect on external ballistics (how the projectile flys through the air). The shape can also have an effect on terminal ballistics and performance with regard to projectile energy transfer on game, projectile expansion and stress to the projectile during this rapid change in medium.  To find out all about what sort of effect the meplat has on a projectile, you can read the full article here.