No they're not a myth. As long as you have lube where the ball meets the chamber you're ok. I have shot my 60 Colt without lube and it didn't chain but I don't recommend the practice. I've got an old 58 that will fire anywhere from two to all six chambers if they're not lubed or have wads. I had hundreds of chain fires with it when I first got it because I didn't know what to do to stop them. The worst I had happen was exploding caps from the flash back through the nipples would pepper my arm. Eventually the loading lever did break but it took three years to happen and I think it was more from trying to force the balls down on too much powder than the chain fires. BTW that was in 69 and I still have the gun and it's one of my most accurate.
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