I was looking for pistol zero standards as well, found a NRA target that was 12" x 20" @ 50':
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=498059 ://http://www.midwayusa.com/eproductpa...eitemid=498059 ://http://www.midwayusa.com/eproductpa...eitemid=498059
Most people zero their weapons for the distance they intend to use it. Pistols are used generally for CQC, so a zero at 50' generates a "hit" when aimed center mass at that distance or closer. If you intend to just punch holes in paper, obviously set the zero for that distance.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=498059 ://http://www.midwayusa.com/eproductpa...eitemid=498059 ://http://www.midwayusa.com/eproductpa...eitemid=498059
Most people zero their weapons for the distance they intend to use it. Pistols are used generally for CQC, so a zero at 50' generates a "hit" when aimed center mass at that distance or closer. If you intend to just punch holes in paper, obviously set the zero for that distance.