old gunner,
first i do not have any of those, BUT i'd like to see some pics of failures, and listen less to internet "facts".
not questioning you , just the source of the stories.
lots of mis-information on the net....
thanks
mike
No photos with the posts I saw. One poster had a friend who'd nearly been blinded by a action failure, the gun later examined and proven defective due to the ground away metal. That rifle was fired only with match quality milsurp .30/06.
The mechanical facts aren't in question, cutting through the hardened carburized layer of a Mauser receiver ring can weaken the receiver drastically. The fact that some of the Norwegian rebarreled rifles had been ground too deeply was something I had not heard before.
If you get one that hasn't been ground too deeply it should be okay, if whoever did the grinding got carried away sooner or later the ring could crack at that point.
Personally I won't invest time or money in a receiver that shows evidence of having been ground that much.
Some action types, such as the Lee Enfield use a different method of heat treatment, the main body of the action tempered much like a sword blade and only the locking surfaces hardened by induction. They don't depend on a hardened shell with softer core, so minor surface grinding isn't removing a hardened layer necessary for strength.
I haven't heard of any of the ground Mum Japanese rifles suffering failures, but Japanese metalurgy was somewhat different, and the Mums were generally just defaced rather than ground completely away.
Another thing to look for since FN Mausers were mentioned earlier.
At least some FN manufactured Mauser bolts lack a radius at the cut of the split lefthand lug. These bolts sometimes end up with a broken away leg of the left lug. None of the incidents I've seen mentioned over the years resulted in damage or injury , but its been recommended that FN Bolts that lack the radius be replaced with surplus German K98 bolts.
I have no way of knowing which FN Mausers were affected by this manufacturing flaw, but it should be one easy to spot by close examination of the lefthand lug.
Milled cuts are radiused for good reasons.
Contrary to popular belief a proof test can't gaurantee that a rifle will never suffer a failure sixty years down the road after who knows what sort and how many rounds have been fired through it. A manufacturing flaw might not show up for decades and only affect a small percentage of the rifles.
The low Number Springfield is an example, less than 100 of 800,000 were known to have failed in service. Some suffered from overheated forgings while hundreds of thousands did not. Unfortunately there was no non destructive method for testing the receivers to find out which were safe.
The basic Mauser design allows for a great deal of leeway in quality of metal and how well heat treated. The thickness of the Carburized shell varies greatly, as does the quality of steel used.
If not messed with the Mauser isn't likely to have any problems, its overbuilt to avoid problems, but when someone starts grinding and filing on one they best know what they are doing.