Coldbore shots

[Joefrazell]

Go get yourself a electric air pump for blowing up air mattresses, tubes ect. Then get a piece of hose that fits in the chamber snug and hook the other end to the pump. Bam..works wonders and most have one already laying around the house.

 

[Velvet]

Go get yourself a electric air pump for blowing up air mattresses, tubes ect. Then get a piece of hose that fits in the chamber snug and hook the other end to the pump. Bam..works wonders and most have one already laying around the house.

Yes...
I was just watching centrifugal PC blowers to make that device. I always use the Labradar so I carry a battery pack for its operation. I was seeing that there are blowers that work with USB 5v, so it's a matter of creating the frankenstein.-
Thank you Joe

 

[Buzzsaw]

There is only 1 cold bore shot per session, sorry

I've got all the barrel coolers made. When you're hunting this winter, where will your first shot go?

with an accurate rig in "normal" ranges , no need to worry..

I'm heading to the range this morning with a .22 Creed and a 6.5 Creed, two barrel coolers, rifle roulette, barrels will never get to "cold bore" status unless I want to wait over night.

 

[jrock]

I've never tested it fully. When doing load workup or shooting strings, I let the barrel cool a minimum of 3 min between shots. That doesn't affect my POI change for that purpose. However, for a true cold bore shot, I let the gun and ammo sit in the rig over night to all be the same temperature and then I map the first 4 shots shooting fairly quickly to simulate a hunting situation. That target is what I base my cold bore POI off of. Like I said, never put the gun down and picked it back up in an hour or so to test again.

 

[Rich Coyle]

I did a cold bore test with a cheap ($135) Midway .25-06 barrel that was rechambered to .257 Weatherby. I stuck it on an old Savage action. For six mornings I fired one shot on the same target.

The idea of paying more for your scope than your rifle was sure true on this one. It had a Swarovski z5 5-25X52.

 

[Greyfox]

There is only 1 cold bore shot per session, sorry

I've got all the barrel coolers made. When you're hunting this winter, where will your first shot go?

with an accurate rig in "normal" ranges , no need to worry..

I'm heading to the range this morning with a .22 Creed and a 6.5 Creed, two barrel coolers, rifle roulette, barrels will never get to "cold bore" status unless I want to wait over night.

I agree with this. IMO, there are more variables then simply the barrel temperature. The constitution of the residues with time, variations in air density, age of the cartridge, etc.may influence POI. EVERY time my rifle is shot, except for a shot at game(or a match), my first shot is a measured cold bore shot with one or more follow ups. With my LRH and PRS rifles if my cold bore accuracy is greater then .5MOA this is corrected with a change of load or rifle.

 

[memtb]

I did a cold bore test with a cheap ($135) Midway .25-06 barrel that was rechambered to .257 Weatherby. I stuck it on an old Savage action. For six mornings I fired one shot on the same target.

The idea of paying more for your scope than your rifle was sure true on this one. It had a Swarovski z5 5-25X52.

This has been long recommended to determine "first shot" characteristics. I read an article many years ago (don't remember the writer), that suggested this method. I believe that he went 10 shots, "not on consecutive mornings", with varying atmospheric conditions, to get a true determination of his rifle's potential! memtb

 

[baldhunter]

Every rifle is different.You really need to learn each one and what it's quirks are.I once had a rifle that was really bad about throwing the first round off several inches from a clean cold barrel.Some rifles are worse than others.What I have found,it's better to leave your barrel slightly fouled from a few shots if your going hunting with it.I have some rifles that will keep the first shot in the group whether it's clean or fouled and some won't,so what I do is go to the range,fire a few rounds to make sure it's on and leave it fouled before the hunt.Most of the time that first shot from a cold bore will stay in the group.

 

[Velvet]

This has been long recommended to determine "first shot" characteristics. I read an article many years ago (don't remember the writer), that suggested this method. I believe that he went 10 shots, "not on consecutive mornings", with varying atmospheric conditions, to get a true determination of his rifle's potential! memtb

Maybe this is the way to go.
A coldbore shot, followed by a second shot, per day or session, even with different ambient temperatures. In this way we ensure that the rifle is completely cold and stabilized.
All shots always on the same two targets (cb and second shot respectively), with the same rest, distances, angles etc.
Two questions arise: how far do the shots? 100, 200, 300 yards? because the wind can contaminate the test, and how many shots to make in total so that it has statistical weight. I think of 10 shots per target would be enough.

I do not discard the devices to cool the barrel down, because they would be very useful for sessions of several shots, to shorten the times, but not to make several coldbores shots in one day.

Very grateful for your answers and comments. I sincerely appreciate them
V

 

[Velvet]

Every rifle is different.You really need to learn each one and what it's quirks are.I once had a rifle that was really bad about throwing the first round off several inches from a clean cold barrel.Some rifles are worse than others.What I have found,it's better to leave your barrel slightly fouled from a few shots if your going hunting with it.I have some rifles that will keep the first shot in the group whether it's clean or fouled and some won't,so what I do is go to the range,fire a few rounds to make sure it's on and leave it fouled before the hunt.Most of the time that first shot from a cold bore will stay in the group.

I agree with you. I forgot to clarify that I clean the barrel every 100-150 shots, and not because the performance deteriorates, but because I don't want carbon deposits created in muzzle brake that can affect the POI. Within 150 shots, the same accuracy is maintained for this particular rifle. You have touched on another theme, which is repeating the same test for completely clean barrels, to see if it behaves the same way, clean or fouled. Exciting theme

 

[Velvet]

Another thing to clarify, is that the rifle has pillars and glass bedding from the recoil lug back. 45lib / inch of torque for a Mcmillan Game Warden stock.
26 "Proof Sendero barrel with a Bastard Apa brake.
We could rule out changes in the behavior of the rifle, due to poor bedding, since it is completely supported by rigid stock and unalterable by atmospheric changes.

 

[tony d willIiams]

My oldest son and me are not scientific about it but the numbers hold steady. We will set up, shoot 3 ~ 5 rounds, open the bolt, set my rifle(s) in the shade. We will walk out to the target, 1/4 or 1/2 mile, mark them, talk about the POI, walk back.
They all hold tight. I don't do cleaning except as a New year's gift to my rifles unless conditions warrant an earlier time.
It also provides me with exercise, us old folks don't get enough unless there is a reason for it.

 

[skipglo]

One can get a lot of Bible reading done while a barrel cools.

Yes. Rich...thru prayer is a good way to get to meet and know God...but if you trespass on my hunting land...you will get there QUICKER!

 

[skipglo]

My oldest son and me are not scientific about it but the numbers hold steady. We will set up, shoot 3 ~ 5 rounds, open the bolt, set my rifle(s) in the shade. We will walk out to the target, 1/4 or 1/2 mile, mark them, talk about the POI, walk back.
They all hold tight. I don't do cleaning except as a New year's gift to my rifles unless conditions warrant an earlier time.
It also provides me with exercise, us old folks don't get enough unless there is a reason for it.

When you say you don't get enough....you are still talking about exercise right?