Russian institute designed a new special projectile for use on FPV drones

New projectile is capable of penetrating 400 millimeters of homogeneous armor. The basis is taken from NURS aviation ammunition.The projectile is six times cheaper, than the basic missile for PG-7VL grenade launcher, which is often used in combat.A specially designed projectile for FPV drones was shown at the Tula Center for Unmanned Systems.
http://roe.ru/eng/catalog/land-forces/strelkovoe-oruzhie/grenade-launchers/pg-7vl/