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I probably have ~400 rounds of WWB thru my Shield 9mm without any issues. But a while back I realized that I had not ever fired my carry ammo (Hornady Critical Defense 115gr FTX). So I popped in the 7 rd magazine that has been loaded with the Hornady ammo for 6+ months. I racked the slide but the first round failed to load so I had to rack it again. The 1st round ejected and loaded the 2nd. I fired twice and the 3rd round failed to eject cleanly and got stuck. Needless to say, having two failures in 7 rounds had me a bit rattled.

But being fairly new to guns and gun care I read and watched some videos on cleaning the M&P pistols and found that my technique left a lot to be desired. In addition I suspect I was anticipating and not holding my wrist strong enough. So after a much more thorough cleaning and with a strong grip I ran 50 rounds of Hornady thru it without a hitch.

-Chip