Dusty Stevens
Shiner
If its a ring around the base all the way around its carbon. Using the proper fitting bronze brush after you scrub it with jb will alleviate it in the future
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If its a ring around the base all the way around its carbon. Using the proper fitting bronze brush after you scrub it with jb will alleviate it in the future
If its a ring around the base all the way around its carbon. Using the proper fitting bronze brush after you scrub it with jb will alleviate it in the future
If all your seated bullets leave a ring all the way around like the one in the picture, your throat may have too small of a diameter for that bullet. You are not even reaching the lands.
The first thing that goes on a chamber reamer is the throat. When the throat starts to go on the reamer it will cut undersize and can leave burrs in the throat as well.
Also ask for a copy of the reamer print that was used to chamber the barrel. Check what the throat diameter is suppose to be. Let’s say it’s specd at .2433”.
Get a good mic and mic your lot of bullets. If your bullets are fat and are at .2433” your size on size and or going back to the reamer if the throat is going on the reamer it could’ve cut undersize.
All that being said nobody brought up....what is the bore and groove size of the barrel you have no the gun? If the bore is tight/undersize that will drive up pressures as well. If that’s the case you will have to back off the loads more than you think. A tight groove is even worse than a tight bore. A .0005” tight on the groove and bore can and will drive up pressures about 10k psi.
You need to know the bore and groove size to the 4th decimal place. Like .2372” x .2433”. Just saying it’s a .237 and .243 isn’t going to tell you anything.
A brush and a paste/abrasive cleaner not used properly will damage barrels. So be careful. There are times I’ll say you have to resort to something like this but if your not careful damage to the bore will result. Say what you want....I’ve got enough pictures of barrels that have been damage by poor cleaning habits.
Also the hard carbon deposits laying in the bristles of the brush can scratch the bore of the barrel as well. So regularly make sure you clean the brush off of any dirt looking particles.
All being said if you have problems it wouldn’t hurt to call the barrel maker and talk to them.
Later, Frank
Bartlein Barrels
The first thing that goes on a chamber reamer is the throat. When the throat starts to go on the reamer it will cut undersize and can leave burrs in the throat as well.
Also ask for a copy of the reamer print that was used to chamber the barrel. Check what the throat diameter is suppose to be. Let’s say it’s specd at .2433”.
Get a good mic and mic your lot of bullets. If your bullets are fat and are at .2433” your size on size and or going back to the reamer if the throat is going on the reamer it could’ve cut undersize.
All that being said nobody brought up....what is the bore and groove size of the barrel you have no the gun? If the bore is tight/undersize that will drive up pressures as well. If that’s the case you will have to back off the loads more than you think. A tight groove is even worse than a tight bore. A .0005” tight on the groove and bore can and will drive up pressures about 10k psi.
You need to know the bore and groove size to the 4th decimal place. Like .2372” x .2433”. Just saying it’s a .237 and .243 isn’t going to tell you anything.
A brush and a paste/abrasive cleaner not used properly will damage barrels. So be careful. There are times I’ll say you have to resort to something like this but if your not careful damage to the bore will result. Say what you want....I’ve got enough pictures of barrels that have been damage by poor cleaning habits.
Also the hard carbon deposits laying in the bristles of the brush can scratch the bore of the barrel as well. So regularly make sure you clean the brush off of any dirt looking particles.
All being said if you have problems it wouldn’t hurt to call the barrel maker and talk to them.
Later, Frank
Bartlein Barrels
Just measured a few bullets and they come out at .2432. I’ve got a different bullet at home that I’ll check tomorrow at work . I have gage pins but they are in .0005 increments . I’ll try and figure out bore diameter but not sure how to do groove dia.
Thx
Mark
Was the brush and paste damage done using the drill, or by hand?Last picture is from using a brush and bore paste. This guy polished out a full .002" off of the lands (the bore) and a .0015" out of the grooves. Barrel only has 800 rounds on it. Started having accuracy issues at 100 rounds!
Was the brush and paste damage done using the drill, or by hand?
Was the brush and paste damage done using the drill, or by hand?
The first thing that goes on a chamber reamer is the throat. When the throat starts to go on the reamer it will cut undersize and can leave burrs in the throat as well
Later, Frank
Bartlein Barrels
The stories Frank could tell... Oh wait, he's telling them! Everybody pay attention and stop concocting new and exciting ways to destroy barrels.
I have to say, the bronze brush and a drill take the cake for poor judgement!
You really need a bore scope with BR-based cartridges. It is the most miserable carbon-fouling combination I have ever experienced. Also think it is impossible NOT to foul the bore with carbon from Varget, H4895, Rel 15, Rel 16 and maybe other powders. Once hard I have found NO solvents that work.
Sure I do use something the helps but cannot tell you what the stuff is for carbon. It is not made for rifles and can do serious damage to blueing and even metal. Yet alone, it is not the answer. Sometimes that brush with IOSSO or JB Bore Paste is a major help. Then again - serious messes may need that darn brush spinning on a drill for the first 4 " or so. By then the barrel is probably on its' way out anyhow.
You need a bore scope to see if that is the issue. If it is, the image will not be hard to find. Black streaks or layers will be filling the grooves and ushered on top of the lands. Look. You will easily see with a bore scope. If no bore scope there is no reasonable way to actually see the problem.