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+--- Thread: Point of Impact - 50 to 100 yards (/showthread.php?tid=10064)
Point of Impact - 50 to 100 yards - lwminton - 10-27-2015
If I zeroed a scope at 50 yards (load 120 gr bullet and 31.3 CFE 223), would the point of impact at 100 yards be higher or lower and by roughly how much?
Point of Impact - 50 to 100 yards - Drillboss - 10-27-2015
Calculators show that a 50 yd zero is pretty much spot on at 100 yds (assuming 2500 fps muzzle velocity).
Point of Impact - 50 to 100 yards - Klem - 10-27-2015
Assuming 2500fps/120AMax, scope height 2.5" above bore and a 50yd zero your round will impact 1" high at 100yds.
(ref; JBM Ballistics, online)
Point of Impact - 50 to 100 yards - Drillboss - 10-27-2015
Good point. I left the scope height at the default 1.5".
Point of Impact - 50 to 100 yards - LRRPF52 - 10-27-2015
You need to know:
* Optic height above bore
* Projectile weight
* Muzzle velocity
* BC
* Temperature
* Barometric pressure
When I zero at 6600ft elevation, then come down to 4400ft, the POI shift is pretty big. I just did that this past week, and the zero stop would't let me go low enough to compensate for the low POI at 4400ft.
50yd zeros normally print high at 100yds though, with your scope height and mv being the biggest factors in how high.
Point of Impact - 50 to 100 yards - lwminton - 10-27-2015
Is the scope height measurement the distance from the center of the scope to the center of the bore?
Point of Impact - 50 to 100 yards - LRRPF52 - 10-27-2015
lwminton Wrote:Is the scope height measurement the distance from the center of the scope to the center of the bore?
Yes. I use calipers.
Point of Impact - 50 to 100 yards - lwminton - 10-28-2015
Thanks all.