E-75, not happy with the gun

Ectar: Don't worry about shooting gold in the E75, it's rarely required.  For as IS-7 side on, try going for the hull, just be careful of that troll spaced armour. I tend to go for just above the tracks on the inner hull. Aim towards the rear for change of engine fire, and above the 3rd/4th wheel for chance of ammo rack.   What looks like flat side armour on the IS-7 is actually angled and a bit of a pig to shoot at. the turret also isn't a great target unless you're aiming down on it (as the curvature gives it a good armour boost). Don't be afraid to get into and trade with other heavies. Angled you can tank quite well, just be careful of the high calibre tier 10's.