The whole OSR thing seems to me to be roughly similar (I said "similar" not exactly the same) to the early on problems encountered with steel shot in vintage shotgun chokes and visibly ringing the choke forcing cone onto the exterior of the barrels.
More modern steel and harder steel choke tubes have eliminated this problem.
The older shotguns, just like "vintage" double rifles have to be careful not to use "harder, less malleable" projectiles.
That's my opinion and 2 cents.....

- Mike