Barrel issue ?? Strange

I don't have any pics from bore scope.
They are factory Hornady 108 ELDMs all new from same lot loaded ammo. No reloads.
Ammo stores in factory box.
I don't use spray cleaners. I go specifically by Montana Xtreme recommendations from start to finish. They are my neighbor and gave me the how to "cleaning tour" of you will.
Several dry patches were used after a few bore conditioners. Too be sure all chemicals were gone, we sprayed entire chamber with carb cleaner (seemed strange) but we did. Then went back through with bore conditioner and then dry patches.
It was bore scoped after all the cleaning to see if carbon ring or fouling was present and none that we could see.
And again, rifle was stored with bipod deployed in the position so mostly horizontal.
Hope that helps answer all those questions. I appreciate the help.
What carb cleaner did you use? Some of those can be a problem.
What 'bore conditioner' was used? I assume you are using a properly sized jag for your bore and quality cotton patches?
What are the Montana Xtreme guys thinking is causing this issue?
 
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