Stupid Cold Bore Question

[Sil17sd]

I am not wanting to argue cold bore vs. cold shooter here just looking for an answer to this question: One of my rifles consistently shoots .6-.75" high on the cold bore at 100yds Then the second shot is half that high then it'll stack them in a .5moa group. I have some pretty good DOPE on it for shots out to 1000 but do not have Cold Bore DOPE to 1000.

So my question is on the cold bore shot should impact be .7" or .7 MOA high at longer ranges.

For some reason I can't wrap my head around this.

 

[Diver160651]

Yes, but the thing to do is create an offset. If your solver does not use offsets, create a CB profile.

 

[TheGerman]

Always stick to your angular measurements. Stay away from 'ruler' measurments as much as you can because to be honest, no one knows what exactly 7 inches at whatever distance is.

If the cold bore is .7MOA high at 100 then you will need to offset any adjustments for your correctly dope'd ranges, on a cold bore, by .7MOA.

For example, lets assume you're only shooting cold bore shots yet your rifle is zero'd for your non cold bore groups at 100.

You take a cold bore shot at 100 and you need to hold/dial .7MOA up for a center hit.

Now you want to take a cold bore shot at 600 and your dope is 6.7MOA. But since its a cold bore, add the .7MOA into dope as your dope is (usually) for your non cold bore shots. Therefore, you hold/dial 7.4MOA.

Refine from there.

 

[Jefe's Dope]

If my cold bore is 3 clicks down at 100 yards, would that carry over to 1000 yards? Meaning, I dial down 3 clicks for 1000 like I do for 100?

 

[Diver160651]

Yes.

 

[TheGerman]

If my cold bore is 3 clicks down at 100 yards, would that carry over to 1000 yards? Meaning, I dial down 3 clicks for 1000 like I do for 100?

Yes, this is why I said stick with the angular measurement (MOA, MIL) because it translates downrange.

 

[Diver160651]

Yes, this is why I said stick with the angular measurement (MOA, MIL) because it translates downrange.

This is the same I mentioned in the first reply.. but suggested he entered his offset in his solver.

If he is off X inches, X mm, over/under his 100 zero. Most programs are set to deal with it rather than trying to remember his manual adjustment. That way no mistakes of forgetting when the adrenaline is high. With cheap apps he might have to set a profile as a stand alone.

FFS for instance has offsets a table just for offsets so if one has a real difference in lets say free recoil vrs loading it is accounted for.. But mostly if a unit might share a system

 

[Sil17sd]

Thanks. That's what I've seen with my DOPE so far. Just wanted to make sure it was angular.

 

[eklarsen]

Here is a little trick you may want to try... after shooting use a bore polish like KG-2 instead of removing all the copper in your bore. This allows the copper to fill in the micro scratches and marks but doesnt remove all of it allowing you to retain your post fouled accuracy.

 

[hereinaz]

Is it always "cold bore" or is it "clean cold bore" shot. I think there is more likely a clean cold bore shift.

As to the question, if you use angular measurements, then it translates at all distances.