Pierced primer in 99% od calibers is bad,very bad. With just undr 20 pierces in that 1911 ,my firing pin is rather rough,from the hot gases. I make sure to wear glasses at all times with that caliber,plus gloves, just in case. In 9mm, you should never get pierced primers, no matter what brand . The small primers help in that reguard and it is mostly because of the large primers that is the issue with the .40Super. I mistakenly put small down, Starline is the only brass that has them. My formed brass uses large.
I sure hope people aren't doing all that panicing stuff again