28 Nosler , h1000 and 180 Burger hybrids

[Tommy T]

Carbon Ring with Zero pressure signs, just barrel break in and low round count?
Have you seen this? I have never had a problem with Carbon rings in the past 45 years so knowledge is only second hand.

Yes I have had it in a couple of new rifles around 200 rounds it's pretty common if you you shoot a lot ,lot of my friends and gun smiths have had the same problem I learned the hard way about it

 

[FullCurl8]

A few pics of the chamber. I don't see a carbon ring here, unless I'm missing something. Thoughts? I will scrub the bore and see what post pic looks like. Fire cracking seems worse than I'd hoped even for this cartridge after 142 rounds. Will pause more than I have been while at range sessions, although I have not been shooting more that 5 in a string before cooling. Pic 1 is with a new unfired case in chamber. Pic 2 is with a 2x fired case. Pic 3 is with mirror removed looking straight down bore. The lack of pressure signs is a bit confusing.

 

[Tommy T]

A few pics of the chamber. I don't see a carbon ring here, unless I'm missing something. Thoughts? I will scrub the bore and see what post pic looks like. Fire cracking seems worse than I'd hoped even for this cartridge after 142 rounds. Will pause more than I have been while at range sessions, although I have not been shooting more that 5 in a string before cooling. Pic 1 is with a new unfired case in chamber. Pic 2 is with a 2x fired case. Pic 3 is with mirror removed looking straight down bore. The lack of pressure signs is a bit confusing.

252