Five line items sit outside the high-explosive and screening natures. The designation families are M15 and M69 at 100 mm, the APFSDS-T M88 and the HEAT-T M88P1 at 125 mm, and the carrier projectile M96 at 155 mm. Each record names the gun or howitzer the source lists it for, and a tracer number is quoted on two of them, No12 on the 100 mm M15 and No 12 on the 125 mm HEAT-T M88P1. Loading differs: the 100 mm items are fixed rounds, the M15 with an assembled steel cartridge case, the 125 mm items separate-loaded.
A fixed 100 mm round for the 100 mm antitank guns T-12 and MT-12, made up of an assembled steel cartridge case and a high-explosive antitank tracer projectile M15 filled with FO-4.5S explosive and fitted with a UT-PE M87P1 fuze and a No12 tracer, intended for antitank combat and demolition of facilities.
155 mm base-bleed carrier projectile delivering RDX-filled bomblets, functioned by a mechanical time fuze.
Filling
RDX bomblets
Fuze
M762 or M577A1 or similar
Projectile weight
46.3 kg
Specifications →
How these natures are specified in tender documents
A tender annex opens with calibre and projectile designation, then gives projectile mass and length, muzzle velocity, mean maximum pressure of powder gases, the propellant or base propellant charge, the primer and the fuze. Tracer data appear on three of the four gun rounds, penetration where the source quotes it, and the carrier record substitutes its payload description and time fuze for those figures.
Designation families and what varies by model
At 100 mm, M15 is listed with a FO-4.5S filling and a UT-PE M87P1 fuze, M69 with a 1.00 kg RDX charge and a UTU M72B1 fuze. The two 125 mm items share the base propellant charge M88 and the KT-EU M84 electro-shock primer but differ in nature, one kinetic and one shaped-charge. The 155 mm M96 is quoted at 46.3 kg with an M762 or M577A1 fuze and ballistic data that depend on the howitzer and charge.
Questions about this equipment
Which records quote a penetration figure?
Two of the five. The 100 mm HEAT-T M69 record quotes 300 mm and the 125 mm HEAT-T M88P1 record quotes 400 mm. The 100 mm M15, the 125 mm APFSDS-T M88 and the 155 mm carrier projectile M96 records carry no penetration value.
What separates the two 125 mm M88 line items?
Nature and the figures given. One is the APFSDS-T round M88, listed with a 591 mm projectile length; the other is the HEAT-T shell M88P1, listed at 905 m/s, 19 kg tabular projectile mass and a UT-PE M87P1 fuze. Both are shown for the 125 mm tank gun D-81, TM (2A46).