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Ok, thanks for the input every one, I have measured the brass and looked up the chamber dimensions, (https://en.m.wikipedia.org/wiki/6.5×55mm) and even the blown out ridge is within spec, I'm...

That is once fired hornady superformance.
Ruger m77 hawkeye stainless 6.5x55
That mark is up inside the barrel (inside the chamber) by about 3mm.

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Sorry guys I've got something wrong here, it was keeping me awake so I have had another measure and I was wrong. The case only protrudes 4mm behind the barrel and that would give the locking lugs and...

Hey guys, I have a question for all the gunsmith types,
I have a ruger m77 hawkeye, I was having a play around with some neck sized once fired brass today and I noticed a pronounced ridge running...