80 grain what? What caliber and load. Are they a premium bullet or just standard factory loads?
Play with this
ballistics program. You can find it here
. It is the second link posted by Klinkers.
It will actually calculate your PBR for you. Let me know if you need help with any of it.
The reloading section of this forum is loaded (no pun here) with info on starting a reloading set up all the way through the most nit picky detail. We love details. [img]/ubbthreads/images/graemlins/smile.gif[/img]