Don’t use carbon fibre cleaning rods, now they dangerous, mate and I, lead slugging a bore, rod broke and the shards went into the back of his hand, me pissing myself didn’t help. Long and the short of it, it doesn’t show up under X-ray so has to be ultra sound. Removed the big bits they could feel and got some of the smaller bits with the ultra. The bits break off trying to tweezer them out. But still has a lot of it in is hand. The bore measured .379, way under 400, made up two sizing dies to get them to size
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