I own a couple of the OM 30 Carbine Blackhawks. I've not had any issues with topstrap flame cutting.
Flame cutting is more common on many guns than most folks think. It's often attributed to light bullets, and hot, fast burning powder. But one thing often ignored is the fact that it usually only goes a little way into the frame,, a shallow cut so to speak. then it stops.
I don't know of the "mv" place you speak of,, (but I'm computer stupid too,) but many of us around here enjoy them. A good set of dies, a proper taper crimp, and a little heavier bullet & you can have a LOT of fun!