Im sure this has beaten to death already... But I have done about everything i can think of about my cold bore shot. many changes have been made to my gun with not much change... (CZ 452 Scout, .22lr) My cold bore shot used to be all over the place. Now after all the things i have done to my rifle over the last six months... stock, trigger kit, bedded action. tried different cleaning techniques. I am now down to this... My cold bore is half a mil high at 25 yards. If I let the gun sit for just a few min the first shot is half a mil high.... and the rest of the shots are spot on! ***! any input would be appreciated.
Cold Bore Improvment
- Thread starter Clayne_b
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On a .22 bore I don't clean it unless I need to. Other than that I can only control so much. I tend to shoot in different setups anyway. It more or less depends on my mood.
What rounds? I am thinking it might be a bullet lube thing. Then again it does not seem like 1 shot would put that much of a temp rise into the mix to make a difference.
In your got dope thread I was inquiring what ballistic program you were using. No answer yet.
What rounds? I am thinking it might be a bullet lube thing. Then again it does not seem like 1 shot would put that much of a temp rise into the mix to make a difference.
In your got dope thread I was inquiring what ballistic program you were using. No answer yet.
allaroundhunter
Member
There is a difference between a cold bore shot and following shot because barrel and chamber temperature affect trajectory. It is a reason that long range shooters a lot of times keep very good records specifically of cold bore shots in their data books.
Even though cold bore shots are typically not in the exact same group as the following rounds, they are consistent (as you have found out). This allows for you to compensate for it and make your cold bore shot hit your target.
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adelbridge
Member
usually it is the other way around where a gun shoots well cool or warm and when it gets hot it can start stringing.
dprice3844444
member
try sending it out for a cryo treatment
It would'a been cheaper to have sold it and bought another rifle. It is easy to get into throwing good money after bad. If it is a tweak I can do myself at little or no cost, I'll try it. I've found it is cheaper to lose a bit on a trade than pay a gunsmith with no guarantee he will make things better.
I'd learn to live with it or send it down the road to someone who does not care about the issue.
I'd learn to live with it or send it down the road to someone who does not care about the issue.
chrome_austex
Member
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Sounds familiar... On my 452 FS (w/ cold bore flier), I tried a bunch of things as well, including fire lapping the barrel and free floating the full stock. In the end I sold it.
I don't know if its the thin barrel or camber temp or what. It didn't seem to be ammo specific. That Walther G22 was fun, but it was a PITA to disassemble and clean, misfired when dirty, and also had cold bore fliers. They both had thin barrels and lots of stock/barrel contact. Great little bullpup otherwise. Sold that one too.
one day I'll own a 22 that shoots to the same POI warm/cold. Whats the secret?
I don't know if its the thin barrel or camber temp or what. It didn't seem to be ammo specific. That Walther G22 was fun, but it was a PITA to disassemble and clean, misfired when dirty, and also had cold bore fliers. They both had thin barrels and lots of stock/barrel contact. Great little bullpup otherwise. Sold that one too.
one day I'll own a 22 that shoots to the same POI warm/cold. Whats the secret?
I did some cleaning on the gun to night, I mopped it with hoppe's 9 and brushed the phuck out of it with a nylon brush. and did a 2 passes with the bronze brush. then ran some easly fitting patches followed by some tight fitting. i was getting lead slivers and little chunks of black stuff out. I repeated this process a few times. I should get a chance to go shoot it tomorrow. I think this is the cleanest this rifle bore has ever been in its life.
ApacheCoTodd
member
One of the more significant factors in "cold bore" variations is residual cleaning effects on the bore:
Remaining patch material
Residual solvent
Residual/excessive protectant/lube
And don't forget the environmental effects of humidity and temperature variation. If you wanna go full psycho on lessening the potential effect, make certain the firearm is in the shooting weather long enough to adjust after having been removed from a; building, vehicle and/or case.
Remaining patch material
Residual solvent
Residual/excessive protectant/lube
And don't forget the environmental effects of humidity and temperature variation. If you wanna go full psycho on lessening the potential effect, make certain the firearm is in the shooting weather long enough to adjust after having been removed from a; building, vehicle and/or case.
Reloadron
Contributing Member
Chrome Austex:
Go to a gun show with plenty of tables. Look for a nice older Remington Model 510 P in good condition. Buy it. Typically in the $100 to $200 price range so just look hard. Not bad considering what they get on some of the new low end .22 rifles selling today.
You now have a very sweet and very accurate .22 rifle with 5 and 10 round magazines available. Just be patient and look.
Just My Take
Ron
Go to a gun show with plenty of tables. Look for a nice older Remington Model 510 P in good condition. Buy it. Typically in the $100 to $200 price range so just look hard. Not bad considering what they get on some of the new low end .22 rifles selling today.
You now have a very sweet and very accurate .22 rifle with 5 and 10 round magazines available. Just be patient and look.
Just My Take
Ron
chrome_austex
Member
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- Apr 10, 2008
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looks like it settled in there and the cold bore flier went away? All of the 5-minute waits on the 2nd target look pretty close to the subsequent groups.
allaroundhunter
Member
The thing is, the barrel temp never got back to what is was for your first shot. After you fired the initial round, the coolest that it was going to get was 93°. Your first shot, that is always called a cold bore shot, is also called a fouler shot. It removes any left over residue from cleaning while also leaving a deposit from the shot.
You really cannot expect your cold bore shot to fit in perfectly with the rest of the group, it just isn't going to happen. It is not your fault, it is just how it works out. You can get it close, but 99% of the time your cold bore shot will increase the size of the group.
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You really cannot expect your cold bore shot to fit in perfectly with the rest of the group, it just isn't going to happen. It is not your fault, it is just how it works out. You can get it close, but 99% of the time your cold bore shot will increase the size of the group.
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T Bran
Member
You may want to try a cold bore target for a few sessions.
Take your first shot on one target and put it away for next time.
Next trip shoot this target again with your first shot.
Repeat this for a few trips and you will have a good idea of how much adjustment is needed for that first shot in the field.
Take your first shot on one target and put it away for next time.
Next trip shoot this target again with your first shot.
Repeat this for a few trips and you will have a good idea of how much adjustment is needed for that first shot in the field.
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