A friend has an older .270 that he has just acquired. It shoots perfectly well for an older gun (around an inch).
However, we have noticed that spent cases have a small divot gouged out of the brass, about 2cm up from the primer end.
The divot is half moon shaped: about three-quarters of a millimetre across, half a mm from front to back and maybe a tenth of an mm deep.
My question: is this a cause for concern? It appears to have no effect on accuracy, but I worry that it might be dangerous (ie. creating a point of weakness on the case where it could rupture).