I spoke with Donnie Miculek about the hi-tek powder coating today and wanted to pass it along here because it answered some of my earlier questions.
He said he has reports of the coating holding up fine to 2400 fps in certain guns. He didn't go into detail because I know that not all barrels are the same even in the same caliber. Different bore tolerances, rifling type, twist rate, etc. But he did say he had reports of it from some of his customers stating as much.
So, in knowing that powder coat can hold up to those speeds, is very encouraging, especially for pistol shooters because that covers essentially every pistol caliber that I am aware of and even many lower powered carbines (30-30 comes to mind as well as others). Heck, even many 7.62x39's for that matter are around 2400 fps ballpark.
He also said that hi-tek coating was never made to be a replacement for copper jacket, it was designed to be a viable alternative to traditional wax lubes and provide the benefit of being less messy to handle/load and reduce the smoke generated by petroleum based lubricants was its' main design function.
But I think it's pretty apparent that if it reduces lead fouling associated with cast bullets, that would still be a great advantage nonetheless.