I have used several cases of these on Hardie 4/4 and 5/4 surfaces with a Hitachi nailer. I had no jams or misfires and experienced consistent penetration. About 40% of the time the glue that holds them together sticks in a small curl at the head of the nail and can be hard to see or feel until you paint over it. They don't bend as easily as normal steel nails. I find them a bit expensive and would only use them for special purposes.
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