Thread: anyone on auckland got go/no go gauges for 260 rem

There shouldn't be an issue, even with gas etched channel you case head is still well supported by the remaining undamaged section of the bolt's face. You would have to do very aggressive polishing to increase headspace - ie valve grinding paste for a considerable period of time. Otherwise as per kimjon. You are left unfortunately with an ugly cosmetic issue. If you are still concerned take more photos and send to your favourite gunsmith for his opinion.