New Posts New Posts RSS Feed - POI Sighting in height at 100 yards
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check for SWFA's No Reserve and No Minimum bid firearm auctions.

POI Sighting in height at 100 yards

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2011 at 22:49
Outrider View Drop Down
Optics Apprentice
Optics Apprentice

Joined: February/03/2011
Location: MS
Status: Offline
Points: 89
Can anyone suggest a good, practical resource/guide for point of impact settings above xero on 100 yard targets when sighting in rifles in common calibers (.243, .25-06, .270, .280, 7mmRM, .308, .30-06) using traditional factory loads so that 200 yard POIs (theoretically at least) hit dead on xero? For example, I have seen suggestions ranging from 1 inch to 3 inches above zero settings for a .30-06. I will be hunting powerlines from shooting houses with distances ranging out to 400 yards. It is my understanding manufacturer ballistics tables are based on test barrel data which differ from actual stats produced by typical hunting rifles.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/04/2011 at 04:59
308 Sav View Drop Down
Optics Journeyman
Optics Journeyman

Joined: July/18/2010
Location: Kentucky
Status: Offline
Points: 362
The test data will be higher usually than your real riffle. It will be close to your 200 yds and off at bit at 400 yds. If you are going to shoot an animal at 400 yds shoot your rifle at 400 yds to know what it is not the theoretical drop.

As far as giving you a sight in for those calibers there are too many different bullet weights and loads to give you that answer. 

A good place to start is with something like this.

choose your load 
set the zero at 200
Set target distance at 100
It will give you the theoretical 100 yds site in.

Like I said before this is a good start to go to the range and to test what your loads and rifle actually shoot. I would never shoot an animal ay a distance I had never shot my rifle at and knew its drop.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/04/2011 at 05:38
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5969
+1 what 308 Sav said.
JBM Ballistics is also a good place to scratch around.

Edited by 8shots - February/04/2011 at 05:40
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/04/2011 at 10:12
jonoMT View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire

Joined: November/13/2008
Location: Montana
Status: Offline
Points: 4814
These guys are right. There's too much variation among loads and barrels to use manufacturer's drops (or for that matter, tests done by powder manufacturers or anybody) as more than a rough guide. In my experience, something like a .30-06 or .308 sighted in 3-4 inches high @ 100 yards will typically have a max. point blank range (inside a 8-10" radius) out to 300-350 yards. 400 is stretching it since drops start increasing dramatically past 300.

You can either get the data you need (muzzle velocity, bullet specifics such as BC) to use a ballistics calculator like JBM to get a better profile or go to a range, sight in 4" high @ 100 and then go shoot out to those distances mentioned to see what you get for drops. You'll want to do that anyway.
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "POI Sighting in height at 100 yards"
Subject Author Forum Replies Last Post
There are no similar posts.
Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.266 seconds.