How many rounds?

[igotta40]

You can watch it happen, bullets come apart in front of the barrel, in a cloud of lead.

I can believe that. I’m not buying the notion that copper bullets are leaving lead in my barrel.

 

[Varminterror]

I can believe that. I’m not buying the notion that copper bullets are leaving lead in my barrel.

They aren’t. It’s carbon.

 

[Walkalong]

I got my supplies together and did the deep cleaning today based on input from Nature Boy & YouTube. It may not be perfect but it’s clean. Before & after.

Barrel looks to be in excellent shape, now that it's clean.

 

[Walkalong]

Soaking for 20min vs. 20hrs will yield nearly no difference in outcome.

Agreed.

 

[3% outdoorsman]

On the first image it appears the grooves are getting filled with lead, creating what could seem like a smooth bore scenario. You are leading up.

Copper jackets dont leave lead.
That's a filthy barrel full of powder fouling and hard carbon.
If you clean your rifle after every shooting session this doesn't happen much but every 3-400 rounds you'll have to do something for hard carbon and carbon ring or you'll think your barrel is shot out after a short time depending on your cleaning regimen.

Anyways iosso,JB, are your friend along with good penatrating oil like kroil and free all

Alot of guys are going to using thoroughclean on a regular basis to cut out the carbon

Also if you'll clean your barrel when you get home after every shooting session they will clean out easier before the carbon and copper sets up . reason bench rest shooters clean guns at range with warm barrel.its much easier

 

[jmorris]

Copper jacket disintegrates in the bore? Yea there’s a lot I don’t know but I’m not buying it.

The quote was "OUTSIDE" not "IN", the barrel keeps them together until it exits, then centrifugal force tears it apart, once it is no longer constrained by the bore.

If you have paper close enough you can see it, as a "spray".

These are plated but around 280,000-300,000 rpm, I have seen it happen with JHP's. Specifically Speer 52 grain JHP's, intended for old 1:14 barrels but shot out of 1:7 twist.

 

[3% outdoorsman]

Basically clean barrel to bare metal then shoot 3-4 fouling shots then restart checking groups if after say 20 rounds they don't start getting tight again check elsewhere .
Muzzle crown etc
I didn't read all post but stating obvious known factors

I'll reread post to see if anything else out of normal stands out

 

[3% outdoorsman]

To be honest from reading your description
Load development,gun cleaning and shooting fundamentals are probably all at at factor.

Id restart load development and focus on shooting with good rest and clean barrel every time .sounds like to much going on only you can figure out.

Stable shooting rest, consistent hand loads, and good rifle cleaning is a start

Check scope ring and base torque,action screws and check out barrel crown.

Reloading component lot changes.
Id start over checking everything over same as new rifle start up getting everything verified