Thurro clean every time?

[Steve Donlon]

Scratches in the lands? What's causing you to believe there's scratches?

It's streaks, looks like scratches. Sorry it's in the grooves. Changed it. Thanks. I don't have any fire cracking yet. I'm using RL16 powder and only shooting 5 shot strings and never let the barrel get hot, RL16 is dirty. So it could maybe be streaks. What ever it is, it won't come out with C4 carbon remover and a tight fitting bronze bore brush. I'm going to try Thorro Clean.

 

[Steve Donlon]

How often do you clean the barrel ? A little less aggressive “ preventive maintenance “ after each range session can keep you ahead of the carbon buildup.

I clean my barrel after every time I shoot. Within a hour. There were a few little srteaks and I let them go. Then each time a little more until every time it gets little more until I"ve seen enough and accuracy is falling off. I waited to long to do something about it.

 

[Syncrowave]

Keep fretting on your borescope, and you'll clean the rifling right out of that barrel.

On my SR, I patch with one wetted with Ed's Red and done. (Whether it needs it or not.) If I want to go crazy (or if the barrel is brand new), maybe I'll use some Hoppe's or some 10% janitorial ammonia to remove the copper.

Other than that, I don't do anything until it stops shooting. At which point, I'm as likely to change the barrel as to try some JB or Iosso. YMMV

 

[jelenko]

It's streaks, looks like scratches. Sorry it's in the grooves. Changed it. Thanks. I don't have any fire cracking yet. I'm using RL16 powder and only shooting 5 shot strings and never let the barrel get hot, RL16 is dirty. So it could maybe be streaks. What ever it is, it won't come out with C4 carbon remover and a tight fitting bronze bore brush. I'm going to try Thorro Clean.

Ah.
I think those are streaks of carbon. I can see them in the first few inches of my 223 barrels.
For my accuracy requirements [ 1/2 to 3/4 MOA] I've been using Flitz after every 50+ rounds to keep the carbon to no more than some in the corners where the lands meet the grooves.

I use Flitz/TC/Iosso on a tight fitting patch and stroke in and out10 times before changing the patch with fresh abrasive.
I'm finding I need about 1 patch/10 strokes for every 10 shots - sometimes a bit more depending on how it looks.

I'm finding no difference in the number of rounds through a barrel before accuracy drops off.

 

[Steve Donlon]

Ah.
I think those are streaks of carbon. I can see them in the first few inches of my 223 barrels.
For my accuracy requirements [ 1/2 to 3/4 MOA] I've been using Flitz after every 50+ rounds to keep the carbon to no more than some in the corners where the lands meet the grooves.

I use Flitz/TC/Iosso on a tight fitting patch and stroke in and out10 times before changing the patch with fresh abrasive.
I'm finding I need about 1 patch/10 strokes for every 10 shots - sometimes a bit more depending on how it looks.

I'm finding no difference in the number of rounds through a barrel before accuracy drops off.

I didn't have the problem in the summer using 4350 powder, then I got the Lapua 144's and switched to RL16 powder and gained 100 FPS and an increase in accuracy , but I need to clean more often with the abrasive. Now I know, Thanks for the advise. I only needed an abrasive before in my AR'S.