Some years back I read a report with photos of a 95 in 30-06 badly damaged by firing a 7.9 mm German military cartridge. IIRC, the article was written by Hatcher. The photo showed a rifle with bulged side rails & a lot of other damage. IIARC, the photo showed the breech block blown clear of the rifle.
In the article, the writer said that the Winchester engineers tried & succeeded in duplicating the damage with several 95s chambered for 30-06. The writer also said that this experiment was a key part of the decision to discontinue the 95 in 30-06. Sharpe tells the same story, sans photo, in "The Rifle in America".
If this extreme (but repeatable) experiment (with very extreme headspace + an over-sized bullet) damaged these rifles to that extent, it seems not unreasonable to think that repeated loads of somewhat lesser intensity might lead to observable damage.
IMHO, all of Joe's advice is correct.
