I’ve never seen a top strap that was flame cut bad enough to be a problem. Cutting usually stops without going too deep. 357 magnums are probably the worst offenders. But I wouldn’t worry about flame cutting.
My friends Dad was a Sheriffs deputy for many years and range master for them for a bunch. He had a Model 66 that I wouldn't have shot anymore it was flame cut so bad. Years and years and untold thousands of hot 125's out of it.
