Well there are alot of thing's that will help you to become better. Heres a link to pictures of where to aim exactly for that 1shot kill.
http://bbs.hitechcreations.com/smf/index.php/topic,269006.0.html For starters when you are zoomed in on a target and have your sites where you think the bullet will hit the bad guy, put your cursor on that distance line as a reference. This will give you a basis for aiming up or down and save time.
2nd depending on what type of tank you are shooting at there are "kill zones" To kill a Tiger-shoot for the turret where it meets the body in a frontal attack, and in the same spot at bottom of turret for a side attack. For the t34-85 as well as the t34-76-in a frontal attack aim for the bottom of the frontal armor, I like to call it a chin shot, and in attack on the side of t34's try to aim from the center of the tracks to 3/4 up the tracks. When fighting a m4-firefly-an m4 may seem very intimidating which they are with that big gun, but go for that same kind of "chin shot" i mentioned earlier bottom of front armor and you will get a 1shot kill. When fighting a Panzer, almost anyplace on a panzer when hit will result in a kill, but you may get a ricochet off of some points in the armor, I aim for the turret.
3rd Whenever possible try to shoot on level ground, shooting crooked may result in missing an easy shot that would have otherwise saved your life.
4th Whenever possible find some sort of dirt mound to park behind, the less of your tank you expose the harder it will be for them to hit you, and also if you park diagonal behind a hill in for example a sherman, most rounds that do hit you will ricochet off of your turret.
5th If your find yourself severely outnumbered supplies can be a lifesaver, a t34-85 parked behind a hill with only the turret exposed is impossible to die in. The turret on a t34-85 is indestructible, and you will have 8 extra chances at surviving with supplies around.
6th If you find yourself wanting to spawn into a field and discover somebody has it camped, spawn in a perkless ride like a panzer and dont try to shoot first sortie, get into your pintle gun and scan for enemies before starting your engine. Wait for the camper to fire a round and kill you, "important" make a mental note of where the round came from, now it is your turn. You spawn in a t34-85 "which has the faster turret in the game" and spin that turret around to where they were sitting, now when they appear blast them and wait for the "you cheated accusations" lol.
7th If you wish to take out the beast the Tiger, which it is when used properly. Ask someone if they would mind setting out supplys for you before upping, if no one will run some out yourself before upping the Tiger. It is important to put the supplys in a spot at least 2,500 yards from the tanks you will be shooting. I recommend a hilltop, but never park with your Tiger facing downhill, as its turret is very weak, and this exposes you to shots on top of your turret. At a range of over 2,500 yards, only truly skilled tank drivers will be able to kill you with supplies around. So have fun putting a Tiger to good use, which isnt often done in Aces High.
If you go into your main gun and zoom all the way in, you can press F-8 and then use your number pad on the right of your keyboard to move the sights up and down. What does this mean? That if your use to how the Shermans sights look, you can make your panzer sights match up with how the Shermans appear. This works well with Panzer, Tiger, and T34-76 models. The deault sight in the Sherman is showing all of the aim references, I align my sights even with 3,200 in the Panzer salute (ALWAYS park in neutral if your engine is off when firing or you will rock back and forth.unless your running your engine then it doesnt matter)
Thought of another GV tip: Ok on certain maps you will find yourself shooting down on someone and you will most likely be shooting crooked. The trick to hitting someone when shooting crooked is to put your mouse cursor where your last shell hit.
Say you see a tank and you take a shot at it, put your cursor where that shell lands. Next put your cursor on the tank without moving it, fire again and if you miss put your cursor where this shell lands. By this point you are within a few inches of the kill just adjust accordingly without moving your cursor.
Tip for shooting over small hills:::::
Position your tank so you can only see over hill with pintle gun..... Line your barrel up with pintle gun.... Now fire....Switch back to pintle gun real quick...once u see where your bullet lands you can sight with curser
And Finally always park with the front corner of your tank toward the enemy as it adds extra angles into where there rounds will hit you....thus causing ricochets.
<S> Also the t34-85 is my ride of choice with the current gv setup...and the Tiger is you have the perks but dont park within 1500 yards of your enemy with it.