.308 zeroing question

R

ROCK-n-GLOCK

New member
If I were trying to zero a rifle for 100yds using run of the mill surplus ammo, but was shooting at 25yds, if I remember correctly, you would sight on tgt and adjust such that the impact was 1.5 to 2 inches below aimed point?
Is that correct for a .308 in general? Reason being, I'm gonna go to a indoor range that is 25yds max and I wanted to set up one of my 308's for 100 yds. If I remember correctly, the bullet is climbing up to about 100yds then flatens out somewhat before the drop starts. I remember 1.5-2 inch below at 25 yds for some reason and can't find my notes!

Thanks in advance
 
For one, are you sure the indoor range will let you shoot the .308, I have never seen that before. Here is some data and maybe you can back off from it.

At muzzle -1.5"
100 yards +2.25
200 yards 0
300 yards -9.04
400 yards -26.04

This also depends on what you are shooting, the rifle, ammo, scope mounts, iron sights.At best I would be hard pressed to zero a rifle at 25 yards and expect POI to be good at say 100 and beyond. No offence intended but 25 yards is a range for pistols. That is In May HOP
 
I appreciate your inputs, and yes This indoor range is primarily for Handguns but, it is expected to rain here for the next 2 weeks or so I am trying to get close, so that when weather permits, I can get to the outdoor range. He has 2 lanes that are "beefed up" for rifles up to 50 cal. Granted 25yds is not that great for rifle, but when it's raining like hell and you got the day off, a day shootin at 25yds is better than not shootin' at all!

I am just tryin' to be in the "ballpark" at 100yds when I can get there. I didn't mean to imply that this would be the final zeroing, rather just trying to get close, to expidite(not waste rounds) when I can get out to the outdoor range. Thanks for the help.....
 
I'll try to help.

About 1/4" low @ 25 yards will put you hitting about 2" high at 100 yards. This is the zero most people with .308 bolt guns use for max point blank range.

About 3/4" low @ 25 yards will put you almost dead on at 100 yards.

Not knowing your load or how your gun shoots these, numbers might not be exact. However, they should get you darn close.

Have fun.

Kilgor
 
You must know the distance that your line of sight is above the bore center. Your bullet is not actually rising, physics tells us that. The bullet has simply not crossed the line of sight at point blank ranges. Depending on how high you have your sights, it is possible that zeroed at 25 would also be zeroed at 100. That is not likely, but possible. If you get dead on at 25 you should be on paper at 100.
 
You are thinking of the "old" Canadian Bull if you learned to zero with a M-16 from the military and having a low zero @25 yds/mtrs. -1.5" @ 25 should have you close @ 100. What I would suggest is once you do get outside to take a zero group at whatever range will be YOUR ZERO and then shoot a group at 25 so later on you will have a reference target. I have 2 targets ... 1 for 100 & the other for my 200 zero. It's crude but if you have any doubt of your zero (rifle got dinged/whatever) and are "space limited" it works. This was discussed on Sniper Country in the last month.
 
You must log in or register to reply here.
Back
Top