First, allow me to made a correction.
I've made a quick check, that confirmed that the standard magazines of SVD are indeed double-stacked.
They just need a little plus of attention and time during hand loading compared to normal rounds but it is nothing difficult, also because we are talking of a weapon destined to a marksman if not to a sniper, not to an ordinary conscript.
The biggest magazine I have ever seen for 7.62x54mmR is a 15 round mag for a WWII Simonov type rifle. The rims stick out a significant distance which makes large capacity magazines too curved to fit into normal webbing.
In fact it quickly becomes a drum which is what they tended to use for that calibre early on with the 47 and 60 round drums for the DP27/28 and DPM, and vehicle mounted DT and DA LMGs. Drums are noisy and difficult to carry in large volumes and quite heavy compared with stick mags or belts and are more expensive to make.
I would also add that conscripts did get issued with SVDs as they were issued to platoons to extend the effective shooting range of the group with the SVD and PKM and RPKs being used for that purpose.
In case of the Chukavin rifle 15 and 20 rounds magazines are available also, so no big deal here.
That is impressive but not ideal.
Obviously nothing against adopting an eventual batch of 6x49mm sniper rifles for spetznaz's use once they would be available but for standard units the actual SVDM and Chukavin are just ok.
A changeover would be expensive and time consuming and I don't think it would be a good idea to try to do during a conflict unless it was considered necessary... that lack of penetration or accuracy is leading to missed shots or failure to penetrate the targets being hit.
Well you have to first resolve the problem of the excessive wear of the barrel and after it to begun to design a fully new weapon from scratches.
Well the 6x49mm project is not new and they have had several weapons being used to test it based on the PK and SVD... I would say the obvious way to deal with excessive barrel wear in a high velocity rifle or machine gun is the same solution as used in cannons... a plastic driving band on the projectile that engages the rifling and reduces the friction and also the wear and increases the velocity of the projectile. They developed a special plastic for the job in cannons that actually increased muzzle velocity by about 10% because of the reduced friction. I am sure they could do the same with rifle calibre weapons. (note most cannon projectiles are made of relatively hard materials and so often they would use a copper driving band to actually engage the rifling and impart spin on the projectiles).
Another option might be fin stabilised rounds in a smoothbore barrel... not actually flechettes because their terminal performance is not good enough even if they are good for penetration. In fact they could use larger calibres like 7.62x39mm with a sabot round that is the new 6mm low drag projectile in this new round, the 7.62x39mm has quite a good large shell case for its length so plenty of room for extra powder. The 5.45x39mm in comparison is a much slimmer case with less powder room. The 6.004x41mm appears to be a longer 5.45 x 39mm case (2mm) and slightly larger calibre (0.45mm) and it looks slim too rather than fat like an old 7.62x39mm round would. They already mass produce the 7.62x39mm round so a sabot round with a smoothbore weapon with a 100 grain bullet that is 6.004mm calibre leaving the barrel at 800m/s like this new round does might achieve the same or perhaps even better performance using existing magazines. With the new propellant and the extra case capacity they might get 6x49mm performance from this new round.
Maybe a revised calibre allowing for a sabot or plastic banded projectiles, but I would think plastic banded projectiles would be ideal as the calibre has already been selected for low drag shape while combining the mass necessary to retain velocity in flight and also presumably retain terminal effects on target too.
Ironic that a 103 grain bullet is not that far off the 110-120 grain bullet some hunters use in .243 calibre rounds, which is a 7.62x51mm HATO (or 308 Winchester) round necked down to a smaller ~6mm bullet.
A popular light deer cartridge.
Infact , to get the advantages of the new ammo, you could not just adjust the existing MGs to the new caliber as they work in the pull and push loading mode, so basically almost one of the possible reason to prefer the new caliber is gone.
The thing is that the Russians seem to have set themselves the goal of replacing all their cold war stuff with new improved stuff and generally they have done that by applying as many upgrades to existing kit to make it as good as it can possibly be and that creates upgrades that can be applied during overhauls to improve things quickly without having to replace everything all at once... like the T-72 upgrades which are based on improvements applied to the T-90 to make it better, while in the background they are also working on fundamentally new stuff that is intended to eliminate the main flaws of what is being used... for instance eventually the T-14 might come in an unmanned version where no crews have to run the risk of being killed... but in the mean time the T-14 maximises protection and safety for the crew.
I would say a SVDM in the new calibre could be made rather lighter with the different ammo and the PKP could also be made lighter.... but more importantly their performance will improve... range, accuracy, hit probability, less recoil, and much lighter ammo.
The new weapons they are introducing all have rails for optics which will help their soldiers take advantage of the increased effective range.
If you look at the new sniper rifle to replace the SVD the reduced size rifle to fire the 6x41mm round looks quite a bit smaller... but of course a rifle in 6x49mm with presumably the new optimised powder should also be smaller than the 7.62x54mmR rifle and would not need the extra long barrels the original 6x49mm weapons had...
For example this is a folding bullpup 6x49mm sniper rifle based on the SVD:
And here it is folded:
Being a bullpup because it allows a very long barrel for a compact rifle, but even being a bullpup they thought it was still too long so they made it capable of folding.
There was also the normal versions of the SVD and SVDS... the latter to reduce length because of the long barrel:
And of course the PK version which has a built in telescopic sight to take advantage of the extra range and accuracy of the round:
If we put this next to this image of the PKT:
You can see the mechanism of the unified new machine gun using 6x49mm ammo is rather smaller and more compact, though the barrel length is bigger.
Note AFAIK the PKT actually has a longer barrel than the PK family because it was used to replace the SG43 machine gun which had replaced the drum fed DT machine gun. All use the same ammo but the SG43 used belt feed allowing more rounds to be fired before needing a reload, while the PKT was just a more modern machinegun that replaced the SG43. AFAIK they extended the barrel of the PKT so its ballistics matched the SG43 so they didn't have to replace the optics used for the vehicle mounts.
I suspect modern coaxial mounts in their new vehicles use software based reticules using laser rangefinders and all weather optics with zoom lenses.
Using newer powders to improve the 6mm ammo types should improve performance significantly.
I seem to remember the specs for the 6x49mm were for a 120 grain bullet moving at about 1,250m/s or thereabouts at the muzzle.
So optical mounts would improve hit probability along with reduced recoil, flatter shooting rounds getting to the target faster.
All the work they have been doing on long range sniper rounds and perfecting projectiles shapes aerodynamically they might get further improvements in performance using new projectiles and new propellant.
I do think it is worth having two different rounds... a smaller lighter round for assault rifles and a heavier longer ranged round for a sniper or battle DMR rifle and machine gun. But improvements in bullet design and propellant means both could have longer effective ranges than existing rounds and also be cheaper to make and more effective in the field.
I would think a heavier rifle calibre round and machine gun might be interesting for coaxial weapons that had better reach and more power... perhaps based on the 9x70mm round. A vehicle would have the stabilised supported gun mount and the optics to be able to take advantage of the extended range it could be used over.
And no, I didn't think that a push only MG in 6x49mm, thus capable of a way greater ROF than the PKM, would end up weighting less than its own 7,5 kilos: just look at the weights of the otherwise excellent MG3 and MAG even if they use the less powerful and more modern (but still lousy IMHO) .308Win.
The unified MG shown above is supposed to weigh 6.5kgs with its bipod and scope included... but every single belt of ammo is also going to be much lighter too so with every belt of ammo you carry for your main support gun is going to be lighter.
Above all it doesn't seem me that such a new weapon would do nothing to resolve the main shortcoming in the actual usage of the PKM/PKP
i.e. that when used as a squad level weapon it need to use a different caliber than the rest of squad.
They found the extra power and extra range of the PKP made it preferred over the RPK box mag fed weapons. As a support weapon it was also easier for other squad members to carry a few extra belts of ammo too... it is easier and lighter than magazines or drums.
Now part of that might be the belt feed which allows more rounds and longer bursts before it is time to reload, and the new RPL-20 will be interesting if they can take that into combat and test its use.... even just for shooting at air targets like drones where firing more than 30 rounds in a burst can make a difference. With a 30 round mag you might catch up to the target and just as you get to start to hit it you need to change mags... whereas with a belt feed you don't stop... or don't stop so often... and belts are lighter than boxes or drums.
Right now they have 5.45x39mm and 7.62x54mmR rounds and a recon unit might have AS and VSS rifles in 9x39mm too.
Having different calibres in a unit is only bad if your supply is compromised or incompetent... or confusing.
Using the right calibre for the job can make a difference.
Western forces are now adding 7.62x51 rifles and MGs to their 5.56mm platoons because experience in Afghanistan is that if you can't shoot a long way the enemy will take advantage of that and shoot from a long way away with PKs and SVDs. They might not be accurate at 900m but they can still get kills, whereas at 900m with 5.56 you are wasting your time no matter what barrel length you are using... and in Afghanistan and elsewhere US soldiers tended to prefer the M4 carbine rifles and the shorter barrels for the FN Minimis which also reduced their effective range. No barrel length would help the round at 800m plus though.
Using the 6x49mm instead of them do nothing on that regard a.t.c. almost in the case of motorized troops it actually make the problem even more severe: BMP and BTR actually carry PKT, so we would have three different calibers in the same squad...
The thing is that when they introduce the 6x49mm it will replace all 7.62x54mm R at once... actually with stabilised gun mounts and optics 6x49mm would probably be more of an improvement for vehicle mounted guns because they will be better able to take advantage of its extended range and increased ammo capacity because of the smaller lighter rounds.
Think instead how would be much more practical instead the idea of adopting the 6x41mm as an unified caliber for both the AK-22s (that would have to adopted anyway given that they consider actual 5,45x39mm to have exhausted its own possibility of further evolution) and TWO RPK for each squad instead of the single PKP+ ammo carrier as it is a.t.m.
I would think for most units that the lighter weapons like the RPL-20 that are belt fed but using the 6x41mm round to extend range and improve lethality... a faster moving bullet that is heavier is going to be more lethal at any range it hits and that a couple of RPL-20s and maybe an RPK-16 with replaceable barrels and 95 round drum mags would be much more potent as would the AK-22 over the AK-12 or AK-15 and RPK-74.
Belt fed machine guns generally distribute belts amongst the entire unit and when you stop you drop all your belts with the machine gunner team and then spread out and the extra fire power of the heavier calibre is useful, but if everyone is firing the same 6x41mm round I would think the fire power of that unit would be significantly increased because essentially everyone with an assault rifle will probably be able to kill enemy forces to 500m at least and possibly out to 800m.
A new sniper rifle in 6x49mm could probably hit group targets at 1.2km+
When the Soviets introduced SMGs in WWII on a large scale it created a serious fire power advantage for them in combat... so much so that the Germans were forced to create intermediate round assault rifles so they could fight from a distance where the effectiveness of the SMG fell away.
Combat didn't suddenly start to only happen at 300m, but 300m didn't fall from the sky either... if you think about it for a second 300m is about the right distance where most full calibre rifles can still hit targets, and assault rifles can do the same, but SMGs are no good and lose their advantage.
This means as a standard weapon you need a battle rifle or an assault rifle because a SMG would leave you vulnerable to someone armed with the other two weapons.
In close combat in a forest or urban area a SMG is just fine as the Soviets learned from the Fins before they started fighting the Germans.
I think 300m is a good rule of thumb because in real combat with iron sights and average ammo and an issued rifle you shouldn't really be firing at anything further away than that... for a start a target that far away is a tiny smudge.
Improved ammo and optical sights would let you hit targets further away, but body armour means you might be wasting your ammo anyway.... and telling him where you are...
The replacement for the 7.62x54mmR is probably more urgent because it focusses on range and power so the new round extends effective range while reducing ammo weight and size and weapon weight and size and also reducing recoil making hits easier.
I have several rifles in 7.62x54mmR and it is a good cartridge that is rather powerful and effective on any game I might hunt in New Zealand.
I have 1938 and 1944 Mosin carbines and I have a few 1891/30 rifles too. I bought an old worn out rusty M44 carbine I was going to use for parts... I paid $65 for it, but when I got it home and cleaned it up it was actually just fine so I had a suppressor put on it and a rifle scope and removed the bolt and put an angled bolt handle on it to allow for the scope mount. You can fire it without ear protection but there is still a hint of a muzzle flash when you fire it...
Existing PKM and PKP could be re-utilized on a dedicated mounting on the roof of light vehicles and logistical trucks or in a dedicated MMG sections at battalion level, same as actually happen for the snipers.
When they decide to make the change it will take a while to meet the needs of their military and various police and other government forces and rear area units will likely continue to use these weapons for quite some time to come... they are not bad weapons, but they are due for replacement.
I suspect they are working on weapons of a new design to replace the existing types... it would be useful to test such things against real targets in real combat so special forces might get some of these things, but the key is their ability to supply things.
Of course half way up a mountain in Afghanistan you are hard to resupply if the enemy has stingers, but these days they could use supply drones and if the enemy want to waste stingers on those then they are welcome to...
After deciding they need better anti armour performance and developing this round (6x41mm) they might find they can get almost the same results with the 5.45mm round by changing the shape of the projectile... perhaps making it slightly narrower with a plastic driving band surface and the new propellant leading to increased bullet weight and increased velocity.
Of course if they do change to 6x41mm then they will need an underwater version as well like the underwater version of the 5.45x39mm underwater round used in the ADS rifle... but that is hardly a big problem.
In fact it might be interesting to look at an ADS version too, though it has the same 415mm barrel length as the AK-12 and presumably the AK-22.
The ADS is a very interesting weapon and its ejection port is forward so you can fire left or right handed without adjustment without getting hot brass thrown into your cheek, but as it blows the empty cases forward through a tube I would say it would not be compatible with 7.62x54mmR rounds so a DMR version would not make sense. With the 6x41mm and 6x49mm ammo however I would say it could be developed as a weapon bullpup family together with a belt fed version in both calibres...
Last edited by GarryB on Sat May 04, 2024 10:45 am; edited 2 times in total (Reason for editing : Corrections and further ideas/comments.)