Is the osr problems coming from older steels or thin barrels?
Is it only on vintage english guns, or are there any continental ones having the same problem?
Are there any pictures on one with the split from solder problem or even hard to see on picture any with the rifling showing on the "wrong" side of the tube. Otherwise its a true yeti

I have a m98 with the boltface taken down for a rimmed cartridge, i would love taking an old 458 barrel from a old winchester or similar and run a few copper studs thru it to see if it can be made to accour on purpose.

So that once and for all it can be settled that it is a problem and what bullets will damage the barrels.

Untill then woodleight bullets sound quite good for my porpose, thats untill that lead ban finaly will strike upon sweden.