the BT has a 45mm cannon which isnt bad for its br. but you may go agenst the char B1 bis which is the first heavy you will ever come across. but be careful the low br is a farse the bis is a heavy and the only reliable shot is the side radiator and the turret ring. but most bis drivers will not give that shot without a fight but more on that later.
The gun will serve you well in your fight agenst light tanks thay will mostly be one shot kills but so are you so try to stay within the tactic tips i give you in "tactics"
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warthunder guide to soviot tanks. the BT-5&7 [complete]
Non-Fictionthis book is to help new players starting the soviot tank line in warthunder get games where thay dont die insensitivity but it is mainly tips and tricks for tankers