Blanket statements are used by experts and fools.
We know that many people for years loaded their own cartridges for personal use in a small and large capacity using black powder.
The reasoning for the early reports of issues of damasc and nitro are as follows.
Lack of education/fundamental understanding of the differences between blackpowder and smokeless, leading to seriously overloaded cartridges, the scoops and measures for black throw large volumes of powder, average joe using the tools he has reloaded with for years gets new fangled smokeless to try without understanding the differences the volume load his measures throw would obviously be overloaded.
Thin barreled guns, like the early CF guns that were converted from percussion or muzzle loading guns with very thin svelte barrels to start with, and often no radius to the action rarely pass nitro proof now and obviously did not back then.
( if you want proof that these early CF guns fail NP look at the June Holts sale catalogue in stocks actions and forends and you will see several of those i describe )
