Posted: 1/11/2005 5:05:27 AM EDT
I'm shooting an AR10 with an A2 FSB and a detachable carry handle and am having problems zeroing. Impact is way too high. I have installed the Bushmaster taller front site post and managed to get it down to only 5" high at 50 yards. If I raise the front post any farther it will be above the wings on the FSB.
What I would like to know is if anyone can tell me how far down range the projectile will be when it crosses my site line. I don't have access to a ballistics calculator.
Thanks for the time and help.
147 grain FMJ
site line 2.5" above bore line
5" high at 50 yards
Let me know if I have missed any data.
I'll assume standard atmospheric conditions at 1400' ASL... Assuming .398 for the BC (closest I could find to a 147gr mil round was a 150gr FMJ-BT).
You effectively have a 500y zero.
Thank you. That is just what I needed. Now to decide whether to remove it and install a gas block with detachable front site or leave it the way it is.
I'm not sure a 500 yard zero will do me any good.