FWIW I run 31.5 gr of WW296 with a 180 gr JHP in .44 mag.............you bet your arse even with a hefty crimp there's gonna be flame cutting.
It only goes so far though. Dunno what % is caused by flame and what % is caused by particle impingement.
Had a minty 629-3 6" shot maybe 100 or so of my hot 180s and yeah a line appeared. Put it up for sale (wanted a 4" instead ) and some d*ckweed claims the gun has had the crap shot out of it, due to the flame cut. Told him it didn't have it before, but got that in not too many rounds and he flat out in the shop calls me a liar.
I asked if he ever shot AA9, WW296 or H110 with light bullets at max+ charge and he said no.
Kinda tore him a new arse after that
Light bullets can cause a problem with certain propellants. They don't have enough "back pressure" to get the powder to burn as well as it should (and why a hefty crimp is needed if one does such loads, and why some loading manuals don't recommend such powders with lighter bullet weights).
So the problem isn't due to shooting light bullets alone, but light bullets can be part of the flame cut equation.