Military Guns and Ammunition

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This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.

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Squad Support Weapon   Army Guns 20+mm

Started 17-Jun by stancrist; 22117 views.

From: renatohm


A modified Barrett rifle firing OCSW ammunition was tested but ultimately not adopted.


From: renatohm



OICW fired 25mm grenades but they were lighter and slower than the ones fired by OCSW - not unlike individual and crew served 40mm grenade launchers.


From: graylion


renatohm said:

pe. OICW fired 25mm grenades but they were lighter and slower than the ones fired by OCSW - not unlike individual and crew served 40mm grenade launchers.

Goodness. did the US ever envision a situation where logistics might be a bit stretched possibly? 


From: 17thfabn


The individual weapon was a low velocity 25 X 40 mm.

The crew served weapon was 25 X 59 mm. 

Like with the 40 mm grenades the bigger one has much better range.

I don't know if the 25 X 59 has a better grenade than the 25 X 40.

The grenade for the 40 X 53 grenade is more powerful than the 40 X 46.


From: DavidPawley


The 25x59 grenade was (is) much better. Higher velocity, HEDP availability, base fused, near double HE capacity.

The Barrett payload rifle (XM109) was a great solution to the perceived need that led to NGSW, but 1. it had a lot of recoil, noise and overpressure for the firer, 2. It didn’t look like what the Army thought they wanted at the time Barrett proposed it.


From: EmericD


JesseH1234 said:

My only potential beef/question on rifle grenades: can you actually get most troops to actually use them?  Is there a way to mitigate the recoil?  Or is everyone just a wimp but France, Japan, and some plucky Balkanites?  My impression is that while RGs are vastly more efficient in terms of payload delivered, most militaries have gone the 30-40mm tube route because rifle grenades are just so unpleasant to shoot. 

Rifle grenades do kick more than 40 mm LV grenades, because they are carrying a bigger payload... and a rifle grenade with the same payload as a 40 mm LV grenade will still be heavier than a 40 mm LV grenade (because of the grenade tail), so you have to live with the higher recoil (than can be mitigated using 350-450 g grenades instead of the 600 - 800 g RG used during the '50s, but you can't really reduce the weight below 350 g and keep a decent payload).

The situation with rifle grenades is pretty simple. With more than 50% of the "West" defense budget, the US is setting the trend in weapons & ammo. Once the US Army switched to the 40 mm LV grenade system, US manufacturers gradually stopped producing RGs, other armies that are buying goods thru FMS process switched to 40 mm LV system, and the industrial base of manufacturers followed this trend. 


From: EmericD


Mr. T (MrT4) said:

25mm OCSW round had both range an ability to penetrate armor 

With an impulse of nearly 60 N.s (13.4 lb-sec = 59.7 N.s), the 25 mm high velocity grenade of the OCSW can't probably be fired from a shoulder weapon.

Rifle grenades do kick, and they just have an impulse around 30-35 N.s (or 50-60% of the OCSW grenade), compared with ~15 N.s for the typical 40 x 46 mm LV grenade.


From: schnuersi


JesseH1234 said:

even a high velocity 30mm cannon won't punch through the kind of armor a good HEAT rifle grenade will.

Not really.
While the penetration of AT-rifle grenades looks impressive on paper its mostly a theoretical number. The warheads are on the light side. Actually extremly light by todays standards and their behind armor effect is low.
A 30x173 mm cannon with APFSDS is conciderable more potent as an anti vehicle weapons.

The low weight is the main reason why rifle grenades are outdated as AT weapons. They simply can not pack the required punch.