Poor blueing or HOT loads?

VTR996

New member
I have a .45 conv. Blackhawk & while cleaning it after a day of shooting I noticed that the blueing is starting too chip like paint sorta. It's on the bullet end, center of two chambers, in 3 places on the side. Could this be from shooting too heavy of a load? The heaviest I use is 300xtp w/22 H110 and only shot it about 1 cyl.full. I usually shoot mild to medium loads in it. In any of the loads I've had no extraction problems or blown primers
 
true salt bluing don't "chip or flake" sounds like powder / lead build up, or maybe its a teflon or other type of coating and not blued.
 
It's a New Model Blackhawk, ablut 2 yrs old I bought brand new. I'm pretty sure it's a blued gun, no teflon coating, no lead. It looks like galvanized metal does when it gets hot so you can bend it, the galvanized coating starts to flake off when you bend it. It's kinda like that but not too that extent.
 
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