I know Woodleigh got a 458 barrel and did some tests using a gauge to see the effect of bullets (his I think) on the barrel.

However strain gauge / expansion of the barrel or whatever
is fine, but it only needs to happen ONCE for OSR to occur.

So you might fire 30 or 300 rounds but the rifling only needs to push through once and that's it.

The other problem is the ribs and causing these to seperate
- I think it was a Chapuis - 400NitroExpress knows more - where it was repaired and then it did it again and the factory told the owner to stop using mono's.

At the end of the day, I and others own expensive guns, good DR bullets are readily available - be it Woodleigh, Hornady or others - so personally I just can't see why people push this mono thing with all the inherant / possible risks associated with it.