The 70mm rockets are produced in a number of countries, including Canada and Brazil.
Avibras claims that the unguided rocket in ground to ground ballistic mode, effectively area suppression, has a range of up to 12 km
This compares to the C1 105mm at 11 km and the C3 at 18 km.
The 70 mm ballistic rockets can be converted into Precision Guided Missiles that can be launched from the same launchers as the ballistic rockets. The converted rocket is known as the Advanced Precision Kill Weapons System II and is considered as a low cost alternative to the Hellfire ATGM. The range of the 70 mm APKWS II in Direct Fire mode is variously given as up to 5 km.
Common warheads available for the 70mm rocket seem to replicate the range of warheads available to 105mm howitzers - both lethal and non-lethal.
Designation Description Weight Payload
M151 High explosive (HEDP) '10 pounder' 8.7 pounds (3.9 kg) (w/o Fuze) 2.3 pounds (1.0 kg) Comp B-4 HE
M156 White phosphorus munitions (WP) 9.65 pounds (4.38 kg) 2.2 pounds (1.00 kg) WP
M229 High explosive (HEDP); elongated M151 '17 pounder' 17.0 pounds (7.7 kg) (Fuzed) 4.8 pounds (2.2 kg) Comp B-4 HE
M247 High-explosive anti-tank (HEAT)/high-explosive dual purpose (HEDP) 8.8 pounds (4.0 kg) 2.0 pounds (0.91 kg) Comp B HE M255 APERS (anti-personnel) warhead 2500 28 grains (1.8 g) flechettes
M257 Parachute illumination 11.0 pounds (5.0 kg) One M257 Candle (Flare) 1 million candela
M259 White phosphorus (WP) 9
M261 Multi-purpose submunition (MPSM) 13.5 pounds (6.1 kg) 9 M73 (Grenade) Submunitions
M264 Red phosphorus (RP) Smoke 8.6 pounds (3.9 kg) 72 RP Pellets
M267 MPSM Practice 13.5 pounds (6.1 kg) Three Marking SMs, 6 Metal Weights
M274 Practice (Smoke) 9.3 pounds (4.2 kg) 2 ounces (57 g) of potassium perchlorate and aluminum powder
M278 Infra-red (IR) parachute illumination 11.0 pounds (5.0 kg) One M278 IR Flare
M282 Multipurpose penetrator warhead 13.7 pounds (6.2 kg) 0.98 pounds (0.44 kg) PBXN-110
Mk 67 Mod 0 White phosphorus (WP)
Mk 67 Mod 1 Red phosphorus (RP)
WTU-1/B Practice 9.3 pounds (4.2 kg) Inert
WDU-4/A APERS warhead 9.3 pounds (4.2 kg) 96 flechettes of unknown weight
WDU-4A/A APERS warhead 9.3 pounds (4.2 kg) 2205 20 grains (1.3 g) flechettes
Fuzing options for 70mm rockets
# Designation Description Arming Range, Acceleration or Time
1 M423 Nose Mount, Point Detonating for slow speed platforms (helicopters) 47 to 102 yards (43 to 93 m)
2 M427 Nose Mount, Point Detonating for high speed platforms 197 to 466 yards (180 to 426 m)
3 XM436 Air burst, Motor-Burnout Delay
4 XM438/M438 Nose Mount, Point Detonating
5 M440 Point Detonating
6 Mk 352 Mod 0/1/2 Point Detonating
7 M429 Proximity Air burst
8 M433 Nose Mount, Resistance Capacitance (RC)
9 M439 Base Mount, Resistance Capacitance (RC), Payload Discharging Pilot-Selectable
10 M442 Air burst, Motor-Burnout Delay
11 M446 Base Mount, Air burst, Motor-Burnout Delay
12 Model 113A Base Mount, Air burst, Motor-Burnout Delay
To my mind providing fire support with something like this is akin to launching direct from the limber.
And while rippling a single type of warhead is possible it is equally possible to mix up the warheads and launch singly over time.
Here's a comparison of Payloads (ie effects).
81mm M821 - 0.68 kg Comp B
70mm M151 - 1.0 kg Comp B4
70mm M229 - 2.2 kg Comp B4
105mm M1 - 2.1 kg Comp B
120mm M933 - 2.99 kg Comp B
And just for reference the US Army's ACERM (Advanced Capability Enhanced Range Mortar) program is looking for a 20 km 81mm mortar. That seems to me to indicate that the Battalion's Area of Interest is getting a lot larger - in fact exceeding the current Brigade's and Artillery Regiment's Area.