Thread: Ballistics software

Gday guys. Ive tried downloading heaps of ballistics apps, and the pro versions etc.but i cant seem to find one that will base calculations off a POI above bulls eye at 100. I run my 308 at 3 inches high at 100 for maximum pbr but ideally would like to be able to input that 3 inch high data and get ballistics tables from that. I dont really know where my zero is. Have i missed something or a programme that does it? Or do i just need to keep going back until i find zero on the range? Cheers