Does anyone know if there is a website that will calculate bullet trajectory if I put a 15 MOA base on my gun. Or will I have to shoot it to see how many clicks for every 100 yds. I shoot a 308 with 168s at 2800 fps. Zero is at 100 - want to be able to shoot 800 yds. 5 MOA will get me to 400 yds and this doesn't match the standard ballistic calculator. any help would be appreciated.