Source:［http://ftr-wot.blogspot.cz/2013/05/086-heat-nerf-confirmed.html］

Two major guns, that were the most complained about

– the German Panzer IV 105mm derp
－and the Sherman 105mm derp
are getting penetration nerfs:

specifically – the German 105mm from 150mm to 104mm
and the US 105mm from 150mm to 101,6mm