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Started By
Message
Sighting in a Rifle
Posted on 11/13/14 at 7:37 am
Posted on 11/13/14 at 7:37 am
Looking for some data on cold bore shots versus warm bore and what the barrel dynamics are. Looking for general data, not rifle specific. Do any of you fellow OB'ers have any good sites with this kind of information?
Thanks in Advance.(is that what TIA means...or is that "Thought I'd Ask?)
Thanks in Advance.(is that what TIA means...or is that "Thought I'd Ask?)
7
Posted on 11/13/14 at 7:49 am to NASA_ISS_Tiger
I believe it's Thanks in Advance, however I had to look it up and I always thought it was Thought I'd Ask.
On to your question. The reason the shots change with warm and cold barrels IIRC is that the size of the barrel changes slightly and has more friction.
The way I sight in is to laser bore sight it and try to get it on paper. 3 shots, check, 3 shots check. Should be about on then.
On to your question. The reason the shots change with warm and cold barrels IIRC is that the size of the barrel changes slightly and has more friction.
The way I sight in is to laser bore sight it and try to get it on paper. 3 shots, check, 3 shots check. Should be about on then.
Posted on 11/13/14 at 7:52 am to NASA_ISS_Tiger
quote:
TIA means
quote:
Thanks in Advance
Posted on 11/13/14 at 7:53 am to NASA_ISS_Tiger
You won't find it. You'll find theories on cold bore shift vs cold shooter and others in endless debates. I do know that DoD research on this topic seems to lean more towards the shooter being the issue with well made modern rifles. Do you do any dry-fire exercises with your rifle? Probably the best way to mitigate that concern.
Posted on 11/13/14 at 7:54 am to NASA_ISS_Tiger
the cold barrel shot will be your first shot on game. once you get that where you want it, the group will tell you how accurate your weapon is.
a lot of rifles will "walk" a little as the barrel warms up. On a decent rifle this wont be much.
a lot of rifles will "walk" a little as the barrel warms up. On a decent rifle this wont be much.
Posted on 11/13/14 at 8:00 am to hardhead
quote:
the group will tell you how accurate your weapon is.
Unless you suck at shooting a rifle... Won't matter how accurate the gun is.
Dry firing or practicing with an air rifle or .22 is a good way to practice.
DON'T FLINCH.
Squeeeeeeze the trigger. Don't "pull" it.
Posted on 11/13/14 at 8:16 am to NASA_ISS_Tiger
lead sled ftw
Posted on 11/13/14 at 8:55 am to beHop
quote:
Squeeeeeeze the trigger. Don't "pull" it.
Yes, I know. Father was a US Marine Expert Rifleman.
BRASS. He imbedded it in my brain.
Breathe Relax Aim Squeeze Shoot.
Shooting is not the problem, I'm just trying to determine the margin of error from a cold bore to a warm bore and the delta expected.
This is more about precision...not necessarily about hunting. It's a hobby I'm starting to take up. Trying to figure out if I want to get into some of the long range competitions at the local range. But I want to understand as much of the science as I can as I already have the time on the scope from hunting/non-competitive shooting.
Going to from "on-paper" to sub MOA is a pretty good leap from what I'm seeing. I'm trying to figure out what steps are necessary to make that leap.
Posted on 11/13/14 at 9:16 am to NASA_ISS_Tiger
Posted on 11/13/14 at 10:13 am to NASA_ISS_Tiger
Posted on 11/13/14 at 10:28 am to NASA_ISS_Tiger
quote:
I'm just trying to determine the margin of error from a cold bore to a warm bore and the delta expected.
If you are a hunter this means nothing to you. Why worry about it?
quote:
This is more about precision...not necessarily about hunting. It's a hobby I'm starting to take up. Trying to figure out if I want to get into some of the long range competitions at the local range. But I want to understand as much of the science as I can as I already have the time on the scope from hunting/non-competitive shooting.
There are several forums on the internet, go to one and ask questions.
This post was edited on 11/13/14 at 10:31 am
Posted on 11/13/14 at 10:39 am to NASA_ISS_Tiger
I will just give you nmy thoughts on it
If barrel has been cleaned and ANY amount of oil is left in rifling or bore chamber the first cold bore shot will be high due to the oil reducing wind resistance. This even happens if you use too much slickem on an arrow shaft in 3D SHOOTING. Anyway the walking of rounds occurs by a non free floated barrel making contact with some part of the stock. As barrel heats up with consecutive shots it swells inside and out. The inner swelling actually tightens the groups, all else being equal. If the barrel is contacting the stock as the swelling increases and the walking continues and usually worsens.
The armorers at the US Army Sniper School in recent years have come to the conclusion that over cleaning the barrel can actually hinder accuracy. They prefer that Army snipers have roughly 40 rounds through the gun before conducting operations , if at all possible. Their belief, and I concur, is that the copper left in the barrel from these rounds narrows the rifling, thus giving first shot accuracy on cold bore first shots.
If barrel has been cleaned and ANY amount of oil is left in rifling or bore chamber the first cold bore shot will be high due to the oil reducing wind resistance. This even happens if you use too much slickem on an arrow shaft in 3D SHOOTING. Anyway the walking of rounds occurs by a non free floated barrel making contact with some part of the stock. As barrel heats up with consecutive shots it swells inside and out. The inner swelling actually tightens the groups, all else being equal. If the barrel is contacting the stock as the swelling increases and the walking continues and usually worsens.
The armorers at the US Army Sniper School in recent years have come to the conclusion that over cleaning the barrel can actually hinder accuracy. They prefer that Army snipers have roughly 40 rounds through the gun before conducting operations , if at all possible. Their belief, and I concur, is that the copper left in the barrel from these rounds narrows the rifling, thus giving first shot accuracy on cold bore first shots.
This post was edited on 11/13/14 at 10:41 am
Posted on 11/13/14 at 11:23 am to AUTimbo
quote:
AUTimbo
Good point that is frequently overlooked by some hunters. Competitive shooters fire a "fouling" shot after cleaning a bore because the cleaning solvents/oils still present inside of the bore will definitely change POI from the first (fouling) shot to the next.
In the case of deer hunters the rifle will be sighted in to a POI after a number of shots have been run through the barrel. A deer hunter will then go clean the barrel of their newly sighted in rifle and be ready to hunt. That first shot which is so important to hunters is actually a fouling shot which will have a different POI than the shots fired after that.
Posted on 11/13/14 at 11:28 am to Douglas Quaid
quote:
Douglas Quaid
True story. When I signed up on TD, I was going to use this name until I saw it was taken. Great minds.
Posted on 11/13/14 at 11:32 am to beHop
You should have gone with Carl Hauser then.
Posted on 11/13/14 at 11:46 am to Douglas Quaid
Yeah I got in a hurry, and I have username ragrets
Posted on 11/14/14 at 7:38 am to beHop
quote:
Yeah I got in a hurry, and I have username regrets
Not as much as I. Trust me.
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