I've used thousands of rounds of lacquer coated ammo with no problems of any kind.
If you think the lacquer will melt, try using a blowtorch on a fired case. It will eventually burn, but not melt.
I don't know where these old wives tales about steel cased ammo came from, but they're just that. Old wives tales.
The greatest enemy of the good plan is the dfream of the perfect plan.
Karl von Clausewitz.