Milsurp Rifle Grenade Launching

The_Champ

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Just thought I'd give a quick report on my own experimenting with launching rifle grenades using my MAS 36/51. Hopefully this information will be helpful to someone.

I picked up a nicely factory refurbished MAS 36/51 earlier this year. Although they feel a little clunky and heavy to handle, they also feel durable as hell. The trigger is decent and the bolt quick to cycle. Mine shoots better groups than most of my Milsurps using factory PPU ammo. This is likely partly to do with the pristine condition of the rifle. I ended up buying a second rear sight to try and bring my windage in line. While I couldn't find the exact sight I needed, I found if I use the left corner of that big fat front post I'm pretty much dead on. As for the grenades, lets just say you can't expect to sell me a rifle with an integral grenade launcher, and expect me not to try it :)

Basically the only information I could find on loading grenade launching blanks, and the safety aspects of this whole operation came from a handful of gun forums. Obviously taken with a grain of salt.

I figured we would start light and work our way up. We pulled a few bullets on factory rounds and tried various light loads of the smokeless powder used by PPU. I haven't tracked down a star crimp, so in the name of keep it simple, stupid, we plugged the rounds using soap!

The first tests were a huge disappointment. The powder just wouldn't ignite properly. I don't know if a star crimp would fix that by letting more pressure build up.

After this my dad suggested we try Hodgdon Triple 7 FFFg muzzleloading powder. We popped in magnum primers to help with ignition, although I suspect they wouldn't be required with FFFg.

This powder certainly did the trick. Again we were careful not to overcharge the rounds, even though the true grenade launching blanks apparently packed quite a wallop. We settled on 40 grains(by volume) of FFFg. Using a M1A2 rifle grenade adapter with an inert pineapple grenade attached, we got around 100-125 meters with a high angle launch. The launch comes with a nice waft of black powder smoke and a bit of back blast of powder residue, so don't forget your eye protection!

Although these loads plugged with soap certainly aren't field durable, the beauty is anyone without a reloading setup could potentially make their own. Simply buy factory ammo, pull the bullet and powder, add some FFFg, and plug with a bar of soap!

The downside is cleaning, but anyone used to dealing with corrosive ammo shouldn't be too bothered. Warm water will wash away that black powder residue in no time, and apparently FFFg isn't corrosive like many black powders.
 
I was firing an M31 practice grenade from my Garand using .308/7.62x51 noise blanks. We got 50/60 yards at a high angle of fire. One of the other guys has a MAS with integral launcher (7.62x51) and he got them down to 100 yards.

I've never thought I would see 20 guys all giggling like little schoolgirls but this did it!!

Check out the 12 annual spring shoot at EOSC evidently there's a link or something to the event.
 
I actually just got finished working up a grenade launching load for my 36/51.

I ended up settling on 12 grains of Unique and i plugged the end of the round with an expanding foam ear plug.

I had no issues with ignition and it launched a M11 practice grenade a good 80 yards.
 
I was hoping to find something referencing grenade launcher loads as I intended to do the same thing with a garand or T81 one I intend to make. (no gas plug for single shot)
 
What is amazing to me is that high angle launch sight on the MAS 36/51 shows that it ranges out to 380 meters! That must have been a serious charge in those grenade launching blanks, and I can't imagine the recoil. My light load of FFFg seems to thump pretty good.
 
Since you guys north of the 49th Parallel are bilingual, I have the French specification for the 7.5 mm French grenade cartridge. In French of course. I would be glad to send a pdf file of it to someone to translate. Then you could make REAL 7.5 mm French grenade cartridges.
 
WARNING ABOUT USING NOISE BLANKS TO FIRE RIFLE GRENADES!

DO NOT use normal "Sound and Flash" Blanks for Grenade Launching of any type (either Real grenades/Inert Dummies or other Substitutes.)

The Proper Grenade Launching Cartridge uses a medium to slow burning Powder, usually similar to the original Ball Load, to get the proper pressure Curve and Propulsive effect. Remember the pressure impulse has to Fill the empty Bore, and propel the "grenade" with just sufficient "Push" not to shatter or detonate it prematurely, nor Bulge the Barrel.("HI-pressure-Lo-Pressure Effect" used in all "bomb throwing" devices, such as Mortars, Shotgun-type GLs (M79, M203 etc.), and rifle grenades.)

Fast Pistol type (or Shotgun) Powders are used for "Maneuver" Blanks for the Flash and sound, and are loaded to operate the Auto mechanism sufficiently for "Functional" Use. Hence they are High pressure (or specifically "High Port Pressure") to replicate the Gas pressures in Ball rounds, with a pressure curve that maintains the Port pressure at around 10,000 to 15,000 PSI for correct Gas/Recoil System operation. I won't go into the physics of the WW I "Bullet Trap" Grenade launching system, only to say it was a variation of the "Hi-P-Lo-P" system, allowing the use of Ball ammo to launch the grenade.

So, again, don't mess with normal "salute and maneuvered" blanks if you want to launch something, whether it is a tennis ball or a proper rifle grenade, or even a "Line Thrower" weight. Use the correct cartridge for the job, and be safe.

Regards,
Doc AV
AV Ballistics Film Ordnance Services.
Brisbane Australia.
 
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