I took my internet purchased Ross 1905 to the range assuming it was a British 303 because it doesn't have any rechambering stamps on it and 303 is what the seller claimed it to be was. Without doing a chamber cast i fired 5 rounds and looked at the fired cases ( i should have only fired one) noticing the shoulders were pushed forward .20 and the necks were much shorter as well as the mouth rolling inward. Also the cases were almost straight. The unfired case tapers from .448 to .396 and the fired cases are .448 to .420. The inside of the mouth is .336 and the rolled in part is .312. I would say the reason the case is rolling inward is because as the case shoulder is moving foward it is being forced into the end of the chamber. The case length is 2.215 and would be longer if it was not rolled inward. The primer does not appear to show any signs of high pressure and the barrel bore is .302-.310. I have since tried using a 308 sizing die to just neck size and it appears to work. I have since found out that my chamber was reamed out for the trenches in WW1 and is not marked as such.
Is this rifle dangerous to shoot because of the excessive head space and if is not than why is there so much talk about too much head space being dangerous and the action/bolt can have a catastrophic seperation