I believe "breakage" has more to do with original but "hidden" defects/faults than with ammo.
But then I have 7 "shooters" , all a little different and mostly mismatched- but they shoot without fail.
I'm curious as to why the Finns would fire their pistols enough to shoot "out" a barrel, hot ammo or not- it's just not logical that a pistol would be fired enough to wear out a barrel ??
Of course they would have replaced barrels with Finn manufactured barrels from Tikka- maybe to achieve some uniformity in configuration (bbl length) ?
They also drilled the "gas escape" hole in the breech block, so perhaps their primers were "thin" and prone to puncture?