Soweit ich weiß kannst Du mit dem OT-810D AT aber trotzdem Panzer angreifen.

Der AP Wert von HEAT-Munition wird nicht von der Entfernung beeinflusst, sondern bleibt immer gleich.

An a different note one important thing to remember is that it's not just a max range buff. AP of main tank guns increases by 1 point for every 350m range you close in. This means at the former range all tanks with the buff are effectively +1 AP. I wasn't expecting this to be the case - I had thought that they'd make the "350m rule" into a "420m" rule to give the same AP at low ranges. For anybody too lazy to work it out themselves:

2275/1925 range: Default AP
1925/1575 range: AP+1
1575 /1225 range: AP+2
1225/875 range: AP+3
875/525 range: AP+4
525/350 range: AP+5

Actually, things get a bit complicated when you get down to 350m. I'm fairly sure that you get an AP bonus for the 175m between 525 and 350, but below 350 you're guarenteed to do at least one point of damage with a hit. I don't know if there are AP bonuses at 175m.

Anyway, this means that within 525m tanks with the range boost get +5 AP. That's pretty epic, and puts most T80s/NATO armour at AP 14, one hitting armour 5 or greater. Leopard 2A4s however will be able to one-hit armour 6 or greater, and T-80Us armour 7 or greater.

Worth bearing in mind that at close ranges this AP bonus favours lighter tanks, just less so than before. If a Rise Patton can use cover to get within 525m range they're effective AP 11, doing 7 points of damage to higher tier T-80s side armour for a fraction of the price. Don't discount lighter tanks... just be aware that you want to be getting them close!