Re: Ross rifle
As stated by JimK, the M1905 Ross is perfectly safe. It's the M1910 that had/has the problem with the bolt being capable of being assembled wrong and could fire in an unlocked condition. It was also the 1910 that suffered most from dirt and grime fouling the canon breach (interrupted screw) type of bolt lugs. There was/is an arsenal fix on the 1910 that alleviated the bolt assembly problem. It consisted of putting a rivet in the bolt body that would then not allow the bolt to be put together wrong.
As for the oversized chamber, one of the weak points of most "straight pull" actions is primary extraction. (Nothing like having a rotary bolt with a nice lever (bolt handle) to crank on to break everything loose). A little crud and not highly spec'ed cartridges just plain couldn't be overcome by the rifles primary extraction. Over the years I've owned and shot a number of Ross's, including a commercial 1910 in 280 Ross. (Beautiful rifle and a hot cartridge.)
Although, I will admit that the rumors of the 1910 bolt coming out was always in the back of my mind......