I have shot thousands of rounds on uncoated aluminum prototypes. From .223 up to 300 NM(on multiple cans) and no signs of fatigue or failure have presented themselves. Most of the testing has been with 6ARC, 6.5 creed, 6.5 PRC, 7SS, 7PRC, 300 WM, 300 NM. ( amongst a few others )
The decision...