Several tidbits from the singleactions.com web site - the poster reported a 30% to 50% increase in accuracy over conventionally sized and lubed cast bullets. To me that is a significant improvement! Second, powder coated cast bullets could be used in Glock pistols with no ill effects...
Not surprising, as most jack up a perfectly good bullet or a moderately unbalanced one through the sizing or loading process, even with jacketed bullets.
The powdercoating is similar to what lubes, paper patching and jacketed bullets achieve: it limits friction directly applied to a low eutectic and generally soft metal alloy.
I think more people worry about lube (which explains a lot of concoctions) way before fit and balance, so its not surprising that powdercoating has so many fans.
