Had a friend shoot some 80 grain cast powdercoated in a 25-45 Sharps rifle.
He shot some other reloads first then tried the powdercoated boolits.
The first hit the target in the same spot as the other ones but the other 4 did not make the trip to 100 yards.
Seems that heat was the problem with that test.
Since that time they have worked well.
He did tell me that he had shot the others without a break in between.
So maybe?