Online ballistic calculators

[OnHoPr]

Do the online ballistic calculators correspond with the loads that you have developed? I am more inquisitive about the lower BC type projectiles like cast boolits, slugs, and muzzle loader, for example BC ranges from .100 to .350 and speeds from 1200 to 2500 fps, with maximum ranges to 300 yards.

[Whiterabbit]

I can't answer your question. BUT, in my 7x57 with a .417 BC bullet, JBM and the shooter app are both accurate enough to hit a man sized target at 700 yards and beyond. With chrono data from a cheap cheap chronograph.