Thread: Sighting in

Refresh my memory if im sighting one of my centerfires in on a 25m range roughly how high or low do i want it shooting done a couple of scope swaps and its been a while the 2 main ones are 7x57 and a 308

Scope height above the bore?
Intended zero?

Pretty much bang on at 25m for a 200m zero on my rifles is what I use to check or get on paper when resighting.

About 200m zero should be good for both

IIRC it's 40m when the bullet passes the line of sight on a 200m zero. Or maybe that's 250m...

You want it to be roughly the height of the scope low at 25y. So roughly an inch or so low.
If you zero it at 25y you will be very high at 100.

300 win mag bey hits the middle every time

Originally Posted by northdude

Refresh my memory if im sighting one of my centerfires in on a 25m range roughly how high or low do i want it shooting done a couple of scope swaps and its been a while the 2 main ones are 7x57 and a 308

Is it just me who thinks zeroing a 308 for 200m at a 25m range a bit odd?.... surely you could find something a bit longer than that?

Originally Posted by LBD

Is it just me who thinks zeroing a 308 for 200m at a 25m range a bit odd?.... surely you could find something a bit longer than that?

Yes - i would never trust a 25m zero for anything other than shooting 25m.
I certainly would not be taking shots at animals at 100+ with a 25m zero and no 100m confirmation.

Must be you a lot of people start at a closer range so you not fuking around so much at 100 or 200 trying to get it on paper

Nothing wrong with short range sighting in.
Do what works for you.
Check if you can at 100- 200m.

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Originally Posted by LBD

Is it just me who thinks zeroing a 308 for 200m at a 25m range a bit odd?.... surely you could find something a bit longer than that?

Not odd at all.
I know where all my rifles shoot when zeroed at the correct range, and at 50m.
I also know my exact boresight at 10m.
Quick check with a shot or look down the barrel is all that's needed to confirm things. I trust either and it has never let me down.

Can also save a bit of doubt if you or someone else has a miss with your rifle.

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I just draw a 1" circle on my target, go out to 100yds and pull the bolt out and bore site it then away you go, 99% of the time on paper

If you are 1cm off perfect left or right at 25m, that's 4cm at 100m, and 8cm at 200m, 16cm at 300m.
Even 5mm adds up to 2cm at 100 and 4cm at 200m, 8cm at 300m etc etc. That's quite a lot and you would need to shoot perfect tiny groups with zero left or right deviation at 25m to even get close.

It really adds up.

Iv got on paper at 25m with what I thought should be a good zero many times only to find it substantially off at 100+
I guess people have different ideas of precision.

Originally Posted by LBD

Is it just me who thinks zeroing a 308 for 200m at a 25m range a bit odd?.... surely you could find something a bit longer than that?

Zeroing, yes I agree, hence my comment about checking (once already zeroed at 200), or starting at 25m to get on paper (before shooting further out). For a 200m zero I much prefer actually shooting at 200m rather than 2 inches high at 100m, but sometimes you don't have that choice.