Powder ring in barrel

[Sports1]

A 6.5 PRC with a powder ring in Christensen BBL. Only 1000 rounds through it in last three years.. Will this continue to do this after a good scrub? any help out there

 

[SigWig]

Barrel life for 6.5 prc is between 1000 and 1500 rounds before accuracy drops off.

Clean it, give it a try...

Start planning a new barrel

 

[DinduNuffin]

Some calibers and rifles are more prone to it....I have a 7 PRC that develops a carbon ring that causes pressure issues after about 40 rounds. To remove it I soak a bore mop in Bore Tech C4 and place it in the throat area of the chamber over night with the muzzle pointed down. The next day use an oversize nylon bore brush(.30 cal in my case) on a chamber rod and shove it into the throat area until resistance if felt and twist about 30 times. Borescope to check. It is also important to note that if you reload don't over trim your brass, it makes a carbon ring more likely to develop.

 

[Hitzy]

Oddly, with my 300 Win mag Bartlien barrel, I get a carbon ring about half way down the barrel after a few sessions, rest of the bore is shiney, couple passes with JB paste it's gone, but it keeps coming back in the same spot.

 

[Buck1950]

Hitzy, is there a slight 'loose spot' (bulge) there when you run a patch thru ? Could be letting C-debris 'collect' there ? Cleaning with JB could be 'expanding' that ? WAG

 

[guntech]

Twisting anything in the bore of a rifle is not a good thing... hard debris can damage the rifling

 

[270WSMXBolt]

edit

 

[pathfinder76]

Twisting anything in the bore of a rifle is not a good thing... hard debris can damage the rifling

I’ve seen BR guys chuck cleaning rods in a drill to brush a bore.

 

[Bustercluck]

Twisting anything in the bore of a rifle is not a good thing... hard debris can damage the rifling

I roughly measure the case on mine and landmark something like the middle of the bolt handle to the neck/freebore area and put one size bigger brush up there until I think I’m in the neck/freebore area and turn it by hand with thorroclean. Rinse and repeat until you stop getting carbon. I do this on all of my rifles every 500-600 rounds, maybe longer if I’m busy.

 

[Bill Leeper]

People who clean their barrels with reasonable regularity never have any carbon build up. In a BR barrel, where I always cleaned inside of 20 shots, it never happened. In an "F" class barrel' where I might shoot 100 rounds without cleaning, I might see a bit of carbon which is easily cleaned out. The same is true of my silhouette barrels. Hunting rifles are cleaned after every range session. I still clean with Hoppes #9 and a bronze brush, just as I have been for over 60 years. Bill

 

[guntech]

I’ve seen BR guys chuck cleaning rods in a drill to brush a bore.

I was in benchrest shooting in the 70's ... for a number of years... never saw any benchrest shooter do that.

Think about it... any hard grit or ring of carbon you are trying to remove is easily embedded into the softer brush... and now you are going to spin that against sharp edges of the rifling...
Normal procedures that go back and forth following the rifling can still do damage... but is not concentrated at 90 degrees to the edges.