Thursday, 30 October 2014

Sturmgewehr Usage

Some of you may have wondered when the Soviets noticed that the Sturmgewehr has joined the arsenal of German infantry. Wonder no more! Via kris-reid:


"To the People's Commissar of Defense, Marshal of the Soviet Union, comrade I.V. Stalin:

Since the Spring of this year, forces of the Kalinin, and then Volkhov and Leningrad Fronts have captured, among other weapons, several specimens of new German automatic 7.92 mm carbines, which are a new type of infantry weapon that has not been previously used by the Germans in large amounts until recently."

The date on this document is April 16th, 1943. Here's the intel obtained on this mysterious weapon:


"Enemy tactics and technology
Engineer-Captain Ya. Krutik

1. New German handheld machinegun

The German army has recently adopted a new handheld machinegun, using an intermediate round (an average between a rifle round and a pistol round). The machinegun's designation is "MK belash 42 (H)". The automatic mechanism is driven by redirection of gases through an opening in the barrel.

The machinegun can fire automatically or in single shots, for which a switch is present in the trigger guard, next to the pistol grip.

The machinegun is fed with a box magazine, which holds 35-38 rounds.

  • Caliber: 7.9 mm
  • Length: 935 mm
  • Mass: about 5 kg
  • Round mass: 16.8 g
  • Bullet mass: 8.2 g"
The translator was a little presumptuous. "MKb" stands for Maschinen Karabiner, or machine carbine. Also, the magazine capacity has grown somewhat from the 30 rounds it actually contained. Otherwise, this intelligence is correct.

Saturday, 25 October 2014

High Capacity

I am sure that many of you have seen those comedic 100-round magazines for AK assault rifles that can barely feed 5 or 6 without jamming up. What you probably didn't know is that the idea isn't exactly new.


These photos are from magazine trials of 30, 40, 50, and 100 rounds. 

Tuesday, 14 October 2014

Precision Comparison

In 1948, it was clear that the PPSh has served its time, and a new, more powerful automatic infantry weapon was necessary, using an intermediate 7.62x39 mm mod. 1943 cartridge. Several weapons were designed to Tactical-Technical Specification #3131 and tested along with their submachinegun ancestor and the German Sturmgewehr for comparison.


The columns represent the radii of dispersion for bursts while prone and single fire while prone. R100 gives the full radius, and Ч50 gives the mean radius. The rifles are as follows:
  • AS-44 type 7 (with 3 vent openings)
  • AS-44 (no changes)
  • Kalashnikov assault rifle
  • Dementyev assault rifle
  • Bulkin assault rifle
  • Korobov assault rifle
  • Submachinegun model 1941 (PPSh)
  • MP-44 (Sturmgewehr)
And the last row is the precision requirement. The summary reads:
"The AS-44 with vent openings (type 7) surpasses all other assault rifles: in Ч50 by 2-4 times, and in R100 by 2.3-7 times. The precision when firing in full auto mode matches requirements."

It is also interesting to note that the famous Kalashnikov made the list. Despite being less precise than the modified AS-44 and failing TTT#3131, the weapon surpasses the Sturmgewehr in all criteria except single fire mode while prone, where the latter has a slight advantage.


Sunday, 13 July 2014

Science Fiction

Sometimes, inventions that are sent in to the military seem pretty impressive. Like this one!


"Comrade Lyadov proposes a super-speedy anti-tank rifle, where the propellant burns as fast as possible, and the bullet is propelled primarily through adiabatic expansion of gases. In order to achieve acceptable pressures, the inventor uses low propellant density. With heavy projectiles, the inventor hopes to maximize the Pcp/Pm ratio and achieve muzzle velocity of 3400 m/s.

In order to achieve a chamber large enough, which the inventor says will need to be bigger than the size of the rifled section of the gun, the inventor proposes a two-piece chamber. One of them is a regular chamber, another, connected to the first, is underneath the barrel. The propellant, as can be assumed from the proposal, all fits in the first chamber."

3400 m/s! Pretty impressive. Of course, there is always a catch.


"When evaluating comrade Litvinov's proposal, it must be noted that the aforementioned muzzle velocity (3400 m/s) was obtained after making critical mistakes in the calculations, which makes the ballistic portion of his project a sad misunderstanding."

Tuesday, 1 July 2014

AK Trials


"Conclusions: 
  1. The 7.62 mm Kalashnikov assault rifle with a model 1943 round satisfies requirement #3131 in reliability of the automatic system, lifespan of components, usage characteristics, and overall, and can be recommended for mass production and subsequent military trials.
  2. The Kalashnikov assault rifle does not fully satisfy requirement #3131 in the category of precision. However, as when firing single shots it greatly surpasses the model 1941 SMG, and is equivalent when firing in fully automatic mode, the Kalashnikov assault rifle can be recommended for military trials with existing precision. 

Recommendations:
  1. Assault rifles, produced according to requirement #3132, which were composed according to military suggestions after AS-44 trials and previous proving grounds trials, are a step forward compared to the AS-44 as assault rifles matching modern requirements.
  2. The best performance of all was by the Kalashnikov assault rifle, which, due to its reliability, component lifespan, and overall, satisfies the requirements, and can be recommended for mass production and military trials with its existing precision, as it is not less than the precision of the AS-44, and the assault rifle surpasses the PPSh-41 in all characteristics."
Tezka also has some more details on the trials. The comparison was between the new Kalashnikov, Bulkin, and Dementyev rifles, compared with the PPSh, PPS, and MP-44. Also, more results:

"When firing in bursts while prone, all assault rifles are equivalent, do not satisfy requirement #3131, and are inferior to the model 1941 submachinegun.
...
When firing in single shot, all are superior to the model 1941 submachinegun, and likewise equivalent."

Additionally, he states that, ergonomically, all assault rifles were superior to the PPSh-41. 

Friday, 27 June 2014

DP Autoloader

Ever tried loading Degtaryev disk magazines by hand? I have, and it's not exactly a pleasant experience. Various devices exist to ease this process. Sadly, they weren't perfect.


"Photo #5: Overall view of Abramov's loader without the feeder or disk.
Photo #6: Filling of a magazine using Abramov's loader. The feeder is disconnected (rounds are fed by hand)
Photo#7: Damage to rounds that jammed in the magazine during loading.


Damaged rounds when loading DP magazines with Koshin's loader.

And another fun one (no indication of what system it "belongs" to):




Sunday, 16 March 2014

Shooting from Horseback

Yuri Pasholok got his hands on a pile of old military manuals recently, including Shooting from Horseback. It's a somewhat lengthy book, so I'm not going to translate all of it, just interesting bits.

"Peculiarities of firing from horseback

If firing a rifle from horseback is done mainly during patrols and other cases when there is no time to dismount, firing a revolver or pistol is often done by a cavalryman.

In battle, commanding fire from horseback is either very difficult or downright impossible. The soldier must rapidly and independently determine how to act, with a blade or revolver, and if the latter, fire, select targets, find an aiming points, etc. Actions of a cavalryman are further complicated by allied cavalry mixing with enemy cavalry. The cavalryman must fire in a way that does not injure his allies.

These peculiarities must be considered when teaching soldiers to handle their weapons. A soldier's ability to fight independently or in a group, display creativity and initiative, and knowledge of ballistics of his weapons are fundamentals of his training.

The issue of shooting from horseback was first explored in the Manual for Shooting from Horseback, published in 1935. That manual demands that every cavalryman must master techniques of firing from horseback with a rifle, pistol, or revolver.

In this work, we make it our objective to share with the writer the practical and theoretical conclusions we have reached as a result of trials.

Trials show that the most effective rifle fire is at a target 100-150 meters away from the rider. Individual riders may effectively engage targets at larger distances. Fire from a revolver is effective at 50 meters when stopped and 35 meters on the move. A group of shooters may engage a target 75 meters away when stationary and 50 meters away on the move.

Precision of firing from horseback is affected by many factors that firing from the ground is not. It is dependent on, for example, the behaviour of the horse. The horse often impedes its rider's ability to shoot precisely, which is why every cavalryman must dedicate much attention to the training of his horse."

The next section has to do with preparation and training of the horse, which isn't particularly relevant. The next section, however, is: loading!

"Loading, preparation, and readying to fire from a pistol or revolver

In all cases, when the cavalryman's weapon is unloaded, load it according to NSD-3 when the command "Load!" is given. Keep your left hand on the reins and do not loosen its grasp.

While reloading on the move on horseback, the rider, without letting go of the reins, moves the revolver to his left hand, and with the index finger of his left hand, presses the magazine release. With his right hand, he catches the empty magazine and places it in his pocket or under his belt. Then he extracts a full magazine and inserts it into his pistol, all the way forward until a click is heard.

After that, the rider puts his right index finger and thumb on the rear of the slide, pulls it back quickly, and releases it (the finger should not be inside the trigger guard during this process). If there is no need to fire immediately, the rider puts his safety on and places the revolver in his holster."

A revolver with a magazine? This is a peculiarity of the Russian language in the interbellum period. Revolvers (namely the Nagant) have been the name of the game for a very long time, and self-loading pistols have only started appearing relatively recently. The term "revolver" is applied even to the Mauser C96 pistol in some Russian language manuals of this era. Delays in this new term spreading led to strange Finnish propaganda leaflets during the Winter War, talking about "self-loading revolvers" (pistols) and "fast-firing revolvers" (submachineguns).

"When the command "Ready to fire from horseback!" is given, the rider extracts his pistol or revolver from the holster, bends his right arm at the elbow, and holds it muzzle up to the right, at about chin level. The safety is off (fig. 1).

The positions for firing from a pistol or revolver are as follows: front (half-turn left and right) and back (half-turn left and right). In the event that the rider shoots forward, the rider gathers up the reins and sends the horse in a wide gallop. He then lifts himself up, puts his body forward, and raises the pistol or revolver above the horse's head (fig 2).


If it is necessary to shoot at a lying target, the rider points his gun downward on the right or left side of the horse. In order to not deafen the horse, the hand must be kept as far away from the horse's head as possible (fig. 3).

When shooting half-turned, the rider gathers the reins, braces his left hand against his horse, and increases the pressure on the stirrups. He then turns towards the target and sends the horse into a wide gait (up to 8 m/s).

When shooting left or right, the rider gathers the reins and sends the horse forward. With his left hand, he braces against the horse, increases pressure on the stirrups, and leans towards his target (fig. 4).


Of all the above positions, the most comfortable ones are shooting right, half-turned, or forward. The most difficult ones are shooting to the left and backwards. This leads to the conclusion that when shooting from horseback with a pistol or revolver, the rider must always position himself favourably against the enemy. If necessary, he must change the direction of movement. When shooting from a stationary position, rotate the horse into an advantageous position for firing.

Aiming and Pulling the Trigger of a Revolver of Pistol

The success of a shot depends on a smooth, and, at the same time, swift pull of the trigger. Shooting from a horse is shooting with open sights, which must be practiced with long and systematic training, both on horseback and on the ground.

When shooting from a stationary position, aim just as you would on the ground, through the center of the sights to the target. Here, the rider must only be careful to ensure that the shot coincides with the horse's exhaling.

Shooting from a horse in motion has its own problems, and differs greatly from shooting on the ground. Constant movement of the horse does not let the rider to line up his sights, as they jump around.

Due to these causes, aiming should be done not through the sights, but using the upper surface of the barrel. The sight line with this aiming will go above normal aiming. This is caused by an angle forming between the sight line and the barrel. At various distances, the deviation changes."

The rest of the chapter is simple math to figure out how low you have to aim, but there is a handy summary.

"The following diagram indicates that the vertical aim point should be as follows:
  • Pistol:
    • Ground target: groin
    • Horseback target: horse's chest
  • Revolver:
    • Ground target: knees
    • Horseback target: horse's knees"
The chapter after this is composed of mathematical tables for compensating for the horse's speed when moving. Basically, aim a little bit in front of the target, since the horse will have moved you over to the proper place by the time you pulled the trigger. The revolver and pistol in question are obviously the Nagant and Tokarev. You will have to do your own calculations for other handguns.

There is also the dispersion for the Nagant. There is no table for a pistol, but the book promises that it is not more than 2-3 cm different.

Distance in meters 15 25 35 50
In place Dispersion in cm Best half (50%) 8 11 15 21
Full dispersion (100%) 14 20 30 42
While moving Dispersion in cm Best half (50%) 18 41 52 75
Full dispersion (100%) 38 63 99 135

Readying, Loading, and Holding a Rifle

Ready your rifle when the "Rifles!" command is given. When this command is given, the soldier grabs the strap with his right hand and slips his elbow under the rifle (fig. 16). Then, he grabs the grooves, moves the rifle up, and flips the strap over his head. Having removed his rifle, the soldier puts its stock on his right thigh, moves its barrel upwards, loosens his reins in his left hand, and grabs the rifle with that same hand (fig. 17).



In cases when the rifle is not loaded, the soldier loads it when the "Load!" command is given according to rules in NSD-1. He must be careful to not point the rifle downwards at any time. After shooting is finished, the soldier takes the rifle strap in the middle with his right hand, flips it over his head with a swift motion, and lowers his hand (fig. 18).



Shooting from a rifle is done when half-turned right, to the right, half-turned left, to the left, and to the rear. The most comfortable positions are half-turned to the left and forward. When preparing to fire half-turned to the right or left, the rider sits deeply in his saddle, turns his waist left or right (figs. 19 and 20), puts his stock to his shoulder, grabs the rifle with his right hand, and lifts it to his shoulder. The left hand holds the rifle underneath the sights and holds the lengthened reins. Do not loosen the reins too much, as the rider must feel the horse after a shot, and control him in case of unruliness."



Shooting in other directions is largely the same.

Shooting from a horse is done largely the same as with a pistol, except with a rifle, you use the sights. A difference from normal rifle shooting is that the bayonet is not mounted. When the bayonet is not mounted, keep in mind the deviations of the bullet.

Distance (m)
Deviation
Up
Right
100
11 cm
10 cm
200
22 cm
20 cm

"As you can see from the table, the rider has a small chance to strike a small target with these deviations, but shooting from horseback is done in exceptional cases only, and should not be done against small targets. It is clear that in this case, a rider may be disabled much faster than the target that he is aiming at."

The next chapter deals with leading your shot when shooting to the side, and is largely mathematical tables.

"Conclusions.

In this book, we aimed to answer questions associated with our investigations. It cannot be said that that we fully solved all questions of shooting from horseback, but practical things can be extracted from the above material.
  1. First of all, your horse must be ready for shooting. Working with your horse must have a systematic and well thought out character.
  2. Training the horse is not enough. The rider must be trained. Only a good rider may shoot well from a horse.
  3. An individual rider may strike a target 50 meters away when still, 35 when. A group of shooters may shoot up to 75 meters. Using a rifle, a single shooter may fire at a target 100 meters away.
  4. Shooting from a horse must be done when there is no time to dismount, an at large targets.
Shooting at large distances is ineffective due to high dispersion."