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Military Guns and Ammunition

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XM-25 here we go again...   Army Guns 20+mm

Started 9/11/20 by autogun; 15718 views.
autogun

From: autogun

12/11/20

EmericD said:

France bought 40 mm HEDP grenades to go with the HK269 F launcher... but we are also using rifle grenades (but don't repeat it, it's a secret!)

How is this expected to work out in practice, Emeric? Will some units have the UBGLs and others the RGs? Or will the 40mm eventually take over?

Some nice pics of experimental US grenade rounds in this thread: https://forum.cartridgecollectors.org/t/grenade-launcher-cartridges/41601

EmericD

From: EmericD

12/11/20

All units will have HK269 F (probably one per fireteam) and riflemen without the 40 mm GL could use rifle grenades instead.

Farmplinker

From: Farmplinker

12/11/20

So what are y'all doing with rifle grenades? How much performance improvement has been made in the last 2 or 3 decades for rifle grenades?

EmericD

From: EmericD

12/11/20

Farmplinker said:

So what are y'all doing with rifle grenades? How much performance improvement has been made in the last 2 or 3 decades for rifle grenades?

Well, the AP/AV 40 PAB Mle F2 is using a bullet trap, so you launch it with a "live" SS-109 round.

With the FAMAS or the HK416 F there is no need to change the setting of the gas block (no block on the FAMAS, and only one setting on the HK416 F) so after firing the grenade, you just need to press the trigger again to fire "KE rounds".

The MV of the AP/AV 40 is just a handfull of m/s smaller than your typical 40x46 mm LV grenade, so the trajectory is very similar, same for accuracy between 0 and 350 m.

The difference is that the recoil is higher because the grenade weight is 435 g, with two times the casualty radius of the typical 40x46 mm LV, and better AP capability.

Farmplinker

From: Farmplinker

12/11/20

Thanks! It's been a while since I read about rifle grenades, so it's nice to be updated.

autogun

From: autogun

13/11/20

I've thought for some time that rifle grenades deserve a closer look. A few years ago, I finished a presentation on grenade launchers (in which I suggested that the advent of advanced sights, air-burst systems and MV rounds seemed likely to result in a specialist grenadier in the section) with this:

If there is a specialist grenadier in the infantry section/squad, will other riflemen still use UBGLs? Possibly not: there is already resistance to carrying the weight of around 1.5 kg (3.3 lbs) of launcher permanently attached to the rifle, with many US soldiers reportedly preferring to carry it as an additional stand-alone weapon, complete with shoulder stock.

This suggests that there might be a case for considering the use of rifle grenades instead. These are less accurate, but typically carry twice the HE load and avoid the need to carry a separate launcher. The French are dedicated users of rifle grenades; shown here is their APAV40 DP in comparison with the M433 HEDP LV grenade.

Mr. T (MrT4)

From: Mr. T (MrT4)

13/11/20

Ole 30mm Yugoslav M60 had 70g of Hexolite or similar explosive and all up weight of 480g 

Real use for rifle grenades was if remember correct 150m , beyond that accurate aiming was not great, but of course, if you had side-mounted optics sights or even ballistic computers as some have for Grenade launchers I don't think there would be much difference in range or accuracy.

But on the other hand GM-94 43mm has more HE charge than 30-40mm rifle grenade(although no fragmentation belt)

GM-94 43mm launcher was always fascinating ,' grenade 250g weight is close to 40mm but it has 130+g of explosive(vs cca 30g in 40x46) and with 85m/s muzzle velocity its also  faster , downside is recoil.

Russian KBP GM-94 43mm Multi-Role grenade launcher

GM-94 grenade launcher in service Russian counter-terrorism task forces Several VGM93 cartridges are available, as follows: VGM93.100 - Thermobaric (FAE) rou...

Red7272

From: Red7272

13/11/20

And given the multiplying effect of thermobaric it's effective radius is probably still as large as a fragmenting projectile. It's a big and heavy launcher as required by the round, but looks much more practical than revolver launchers which are even larger and heavier. 

gatnerd

From: gatnerd

14/11/20

autogun said:

This suggests that there might be a case for considering the use of rifle grenades instead. These are less accurate, but typically carry twice the HE load and avoid the need to carry a separate launcher.

I think this idea has a lot of merit in light of emerging optics technology.

The Army is looking to go from IR lasers to IR Laser with integral range finder:

https://www.army-technology.com/news/l3harris-secures-order-for-delivery-of-storm-2-to-us-army/

Meanwhile, Matbock has come up with a simplified grenade launcher sight. The range to target is entered, and then the weapon is simply raised upward. When the right angle for the range is achieved, a light turns green, signifiing for a shooter to fire.

https://taskandpurpose.com/military-tech/grenade-launcher-sight-socom

If the 'grenade launcher angle' feature of the matbock was added to the IR Laser range finder (seems like a pretty simple addition) then every soldier would essentially be equipped with a Grenade FCU for firing rifle grenades, with a minimal increase in bulk vs the current Ir laser sight + range finder.

The only problem I see - possibly insurmountable - is the switch to 100% suppressed use. At a minimum, this would require greatly expanding the diameter of rifle grenades to be able to slip over a suppressor. 

I also imagine firing a RG with a 6.8 would result in pretty insane levels of recoil. Plus whether a bullet catch system could contain 6.8 AP.

autogun

From: autogun

14/11/20

gatnerd said:

The only problem I see - possibly insurmountable - is the switch to 100% suppressed use. At a minimum, this would require greatly expanding the diameter of rifle grenades to be able to slip over a suppressor.  I also imagine firing a RG with a 6.8 would result in pretty insane levels of recoil. Plus whether a bullet catch system could contain 6.8 AP.

All good points.

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