New barrel first three rounds look at this brass
#15
Had a batch of barrels where some exhibited similar "striations" as I called them. Manufacturer agreed cause was probably reamer chatter. Solution was a quick polishing of the chambers with a ball-hone like this Flex-Hone or similar.

We considered it a manufacturer's defect, even if cosmetic and not functional, and covered under warranty. Brass should come out clean and smooth.

Don't know if that's your problem in this case, but sure looks very similar.
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New barrel first three rounds look at this brass - by BluntForceTrauma - 07-04-2022, 04:16 PM

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