The ammunition used here is 5.56 M855.
M855 has a mass of 62 grains and despite its semi-AP design, it doesnt actually exceed FMJ ammunition when it comes to penetration at muzzle velocity. At longer distances where the velocity of the projectile is reduced, the steel tip design will have higher penetration than FMJ. M855 is easily recognizable by its green painted tip, and used in many 5.56 platforms (though it is currently being replaced by the newer M855a1).

The steel target is a high hardness structural steel. The johnson cook strength and damage models are based on Secure 500 steel by Thyssen Krupp. The other variables used are based on similar steels, but may differ. The penetration seen here is unlikely to accurately represent true secure 500 steel.

This simulation was ultimately done in preparation for a future study about the bodywork effect (K effect). That study will use the same setup, but will have 2mm added to the (currently) 6.5mm steel target. The goal is to show how damage and deformation to a bullet can actually increase the penetration capabilities by changing the failure mode. This effect is often observed with M855 ammo.

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