Alright, Ive got the T-43 and the IS-3, let me tell you my thoughts on russian tanks.
T34- I have had great experiences in this tank, but most of it is with the fast firing gun, the Zis-4. What I did was either snipe enemies with rapid fire, or play the peeking head out game with heavies. If you aim for their treads as they are going in or out of their hiding place, you can detread them with their turret stuck behind whatever they were hiding behind, but the front third of their tank is exposed. This is how I would fight things like the T-29. But note that your health is not great, so be fast on the draw. Dont be afraid to simply walk away from fights in your medium- any hits on your rear are death sentences when you get into higher tier battles(fire or ammo rack).
quick note: I would not go any higher than the mini derp gun on the T34-85: the sniper gun and turret seemed lackluster to me. On the whole, I am not a big fan of mediums, probably due to the propensity that they catch fire and die.
KV-3->IS->IS-3
so- the KV-3 gets a gun equal to the stock gun on the IS-3, and more hull armor than the IS-3… hm. I never noticed that. Well that explains some of the balance changes
The sheer speed difference of the IS and the KV’s is what felt like the big boon for me. The IS is still one of my favorite tanks in the game, although the IS-3 feels like an IS with just a tune up and a slightly improved gun. One thing about the russian heavies- I always felt that their crummier HP was offset by the fact that the treads were giant sponges of awsome, which they lowered a bit in the patch but it seems as though not entirely. I would not hit a KV-3 in the front bit of tracks, I would aim squarely for the middle of the tracks, and maybe a bit high, to try and avoid crippling his tracks again and again. I had a KV-3- the tracks are very similar to the KV, and they just absorb damage for you.
As for the IS line- play them as close range tanks and you will go far.
IS-3: This tier just breaks matchmaking. Since there are so few tier 9s and 10s- maybe 75% of my battles I am top tier in this tank. Only once have I been in the lower half(mass T9 platoons). Although I have figured out a few ways to fight lowes, as there are 3 or 4 facing me in pretty much every battle.
Never get into a sniping battle 1v1 with a lowe- you will lose.
Never aim for the turret of the lowe, you will never penetrate.
Most lowe drivers I fight arent that bad, for some reason I see a lot of terrible Tiger II drivers.
Side shots with the upgraded gun penetrate every time for me, great way to take them out. Otherwise just shoot above the left track- or even right into it if he is at an angle that makes it flat.
Russian Mediums vs. heavies
one really weird fact that I did not know until I was talking to my buddies about their tank HP.
IS, T7 heavy: 1100 hp.
Armor: 120/90/60 and turret: 100/90/90
T-43, T7 medium: 1100 hp.
Armor: 75/60/60 and turret 90/62/62
what throws me off is the health values: that extra 30 armor makes my IS last so much longer than a T-43 in any situation, even when the german stock medium has 100 pen.
Penetration
As for the penetration guage- I dont think it takes slope into account- for my IS-3’s gun has green at all times (with 225 pen) and I still have some bounces on lowes and high tier stuff. But I have never bounced a side shot or a subsystem shot.
My 3 top aiming sectors are:
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the top back of the tank where pretty much every tank keeps its engine [only able to shoot this from elevated positions, but I will still go for it if its a 50degree angle.
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side of the tank, easy to go through the tread with high pen guns.
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if it is not an american heavy, back/left side of the turret. Looking through the schematics of the tanks, ammo for most of them are stored there.
http://forum.worldoftanks.com/index.php?/topic/3688-tank-blueprints-and-schematics/
If I have to shoot a tank in the front(me in a lighter tank, mediums or a lower tier), and I know it has heavy armor, I shoot for one of two places.
1.aim for ports and holes you see in the front armor, usually good at killing driver, gunner, something.
- Looking at the front of the tank, I shoot for the spot just above and to the right of one of the treads-shoot it maybe a quarter of an inch off of the tread- this is how I kill hetzers from the front in a crummier tank.
If you must shoot them somewhere else, just go for luck shots on the turret if you cannot penetrate their front armor.
EDIT: I dont know if my next to tread shot has any context, or is any better than shooting things in the front- I seem to be pretty lucky shooting things there.