#Micro-caliber
Modern Historical Intermediate Calibers 024: The 4.6x36mm HK/CETME
Today we’ll be looking at a round with one of the strangest-looking projectiles ever designed for a military weapon: The joint Heckler & Koch-CETME 4.6x36mm round designed for the HK36 en-bloc clip fed assault rifle. The rifle was, as the name suggests, developed by HK, and based on their successful family of roller-retarded blowback rifles, including the G3, MP5, and HK33. It fed from an unusual fixed 30-round magazine, which was loaded from the side through a panel with a polymer 30 round en bloc clip. The projectile was developed by Gunther Voss, of CETME, the very same who invented the unique aluminum-cored projectiles for the 7.92×40 CETME a couple of decades earlier.
H&K's Other 4.6: The 4.6x36mm HK36
Hognose tackles one of the most confusingly designated of all Heckler and Koch weapons, the HK36 (distinct from the G36) and its 4.6x36mm round (itself distinct from H&K’s 4.6x30mm PDW round):