Just how dangerous are these low number guns?
Shooting a 150gr bullet at 2700fps is pretty darn dangerous.
Seriously, the majority of folks believe them to be a danger to the shooter and do not recommend shooting them. Obviously I'm in the minority and for reasons that have to do with research and hands on.
If someone will take up the other side and present their evidence (more then everyone knows they are bad or I have a copy of Hatcher's Notebook) I would be happy to debate the subject, in detail.
To summarize, the double heat treated and the nickle steel 1903's have an increased margin of safety over the single heat treated (low-number) 1903's. A few of the LN's had burnt steel but now all LN are considered unsafe and most people feel that even a proper made LN rifle will fail if the case head fails.