640 hp vs 160 dmg = 4 shots.
640 hp vs 200 dmg = 4 shots.
It does not make any difference vs medium armor, only vs panther and above.
I say again, that damage increase is still worth something and is really good.
People need to stop thinking in terms of tank "kills". In this patch repair takes a LONG time unless they have like 3 squads of sturmpioneers and if they do, you should be using your recon and artillerying them whilst they are repairing with that blob, that blob is worth like 1000mp and they will all be clustered and easy to kill. If you heavily damage a panzer 4/jagdpanzer etc, the tank is down for repairs for several minutes. This is ample time for you to push/attack/follow up with artillery. I believe the vet 3 buff also says it gives more penetration? or is it accuracy? which is a straight buff.
More damage = notably longer repair time <--- this is very very good for you.
Not to mention more damage means you are also more likely kill it if the vehicle has been damaged by other things (making the firefly very good at getting kill hits) and makes it easier to kill with other things (i.e. an ally's bazookas that deal like 1 damage
) Tanks are always going to be taking damage from other things at the same time which will make the extra damage usful, (allied ptrs rifles? bazookas? 6pdrs? other tanks? mines?. They all deal varied damage so it will not always be still 4 shots to kill, your firefly shouldn't be operating alone anyway.
People get scared of their tanks taking a lot of damage at once, especially if it's more than the amount they expect it to take, they are a lot more likely to get scared and pull out if a vet 3 firefly is shooting at them so you can scare them off diving you.
Also if you hit that tank 3 times, the maths state it will be on 40/640 hp... there is no way that tank still has an operational main gun.
I say again. Forcing something to repair for 4 minutes is very nearly as good as a kill, on 30 fuel a minute a person can build a panzer 4 every 5 minutes. (Obviously they aren't spending fuel to fix it however)
So yeah maybe 4 shots if it's on it's own which it shouldn't be. So if it has to take that extra shot, it's your own fault.