ARGH

What kind of round is a 106mm M-DN11 HEAP for the M40 family of recoilless rifles in GURPS terms?

The 106 mm HEAP M-DN 11 is a fixed round with the projectile rigidly secured to the perforated steel cartridge case by a crimping groove. The projectile has two indexing buttons 180º apart on the forward bourrelet and a pre-engraved copper drive band encircles the projectile just forward of the base. The projectile is a thin-walled aluminium shell with a conical ogive, filled with 770 g of hexogen with 5 per cent wax. The internal surfaces of the shell body are lined with 1,000 steel pellets set in resin. A nose-mounted M-DN 121 fuze may be preset for either instant impact functioning or delayed action. In either instance the usual blast effects are enhanced by the scattering of the 1,000 steel pellets. The perforated steel cartridge case may either be M93B1 or M94B1, both with an M57 percussion primer press fitted to the base. The propelling charge is 3.65 kg of M26 propellant powder in multiperforated cylindrical grain form, known in Spain as Fil 349. This round has a maximum effective range of 1,500 m, although the maximum range possible is 7,640 m. Muzzle velocity is 560 m/s. This 106 mm (actual calibre 105 mm) recoilless rifle HEAP round is produced in Spain by SANTA BARBARA SA and DEFEX SA. It is primarily intended for anti-matériel or anti-personnel use and contains 1,000 steel pellets.

 

That sounds like a normal, everyday, HE round with the pellets added to make up for the thin skin of a recoilless round.