Thorroclean slow down the barrel?

[SSchnd]

Shot a LR match recently with a F TR rig, chrono'd one of the three strings. Velocity was right in line or just above what I have been seeing, and I have used the Thorro-Clean as of late to the bare steel.

 

[LVLAaron]

I find this stuff works REALLY well.

I just used the ThorroClean on a 223 30" T/R barrel. It took a lot to get the carbon out of the bore.
I used the Iosso brush also. I ended up going back to my JB paste/Kroil to get the barrel down to bare steel after about 100 strokes combined 3 cleaning steps using ThorroClean.
Not so impressed with the ThorroClean yet. TBD if I am a proponent.
I had used C4 before this and the dry patches were coming out clean before bore scoping the layer of carbon.

Sadley I did not have the chrono last Saturday when I fired it again. I ran 6 rounds through it using a 1/2" dot for fowler shots it seemed to settle after 4 shots.
The subsequent group of 20 was a 1/2" hole of 17 shots with 1 low ten and two high tens all on me.
Sorry I cannot confirm velocity was the same or not though.
I did not see any ill affects going back to a bright clean bore after those few fowling shots.

Make sure the white bottle of stuff is mixed thoroughly. The abrasive stuff settles in the bottom, and it's really hard to tell because it's the same color as the bottle. I had to break it up with a long screwdriver and then shake the shit out of it.

 

[Link]

I used wipeout patchout pretty religiously & thought I had clean barrels until I purchased a bore scope, from start of lands for about 8 inches was black then rest of barrel shiny. used thorroclean as directed with losso brushes probably two sessions on each rifle I own & black was gone on all. 6BR, 6 CM, .223 fullbore & .204 Ruger. I have tried JB bore paste before also & it didn't take out as much carbon as Thorroclean. first patches were very black.

Does wipeout wipeout carbon?

 

[JBT47]

Does wipeout wipeout carbon?

Hard carbon in first few inches, no, not even a little. If Wipeout is used while barrel is still warm from shooting then it may keep carbon at bay and prevent hard carbon build up if you use a bronze brush.

IME, every barrel of mine will need an abrasive to remove this glazed carbon at some point. I have never found a liquid non-abrasive solvent that will remove it once it hardens. To prevent this hard stuff takes meticulous care via frequent cleaning intervals using bronze brush immediately after shooting before it hardens.

I’m sure there are some who never have to use abrasives for the life of the barrel. YMMV.

 

[JEFFPPC]

Using Iosso, Thoro, JB, abrasive of your choice I don't understand the fear of opening the bore/ throat dimension. If you confine the cleaning to the carbon area and quit as soon as the majority of the carbon is gone I fail to see the point. Now if you determine you are going to give it 100 srokes the entire length of the bore before you check it, OH LETS DO 200 IT WILL BE CLEANER, then perhaps you caused yourself a problem due to lack of common sense. Of course I imagine if your obsseive and want a mirror finish, you might end up with a problem. Speaking about not clean, every time I read nylon brush my eyes roll back in my head. Of course only cleaning ever 100 rounds or so is another topic.

 

[divingin]

Its not the product that causes the slow down but having a clean barrel. From the experiments my rifle club have done we found on average a 6fps slower first shot or what a lot of people call cold bore shot. better term would be clean bore shot. By the third shot the speed was back to the normal operating speed.

6 fps? Can you even measure that within a string of shots?

Without using abrasives, I get more like -50 to 75 fps for the first clean bore shot. Enough that I've started shooting 2 garbage fouler shots before getting serious.

 

[BuffaloBill]

I’ve seen about 50fps slower on my 6Creedmoor after cleaning. At 527yds the first shot lands 2-3” low.

 

[swd]

I gave my BRX a hard cleaning with Thororoclean last week before our monthly 1K club F Match on Sunday. The first round was slow the second round went RIGHT back to 2975 where it should be. Whether I do a moderate cleaning with a bronze brush and Boretech or a hard cleaning with Thorroclean my first shot is always slow. 1 round and it's right back.

 

[RabbitSlayer]

Its normal for it to slow down when you scrub it down to bare metal. Winning in the wind just did a good YouTube video on this a week or two ago.

 

[jelenko]

JB bore paste before also & it didn't take out as much carbon as Thorroclean

JB is a very non aggressive cleaner.

I've used JB, Iosso and Flitz. JB is at least 1/2 as slow at removing hard carbon.