I use WW white box or Federal American Eagle when I buy, when I get practice ammo issued, it is American Eagle, Ultramax, or a couple of other commercial reloads. I never had any issues with any 9mm ammo through my 3rd generation Smiths...what I'm really wondering about is something cheap for the M&P...is aluminum Blazer working for your guns, or is that TOO cheap? A couple of guys I shoot with use it, but not in M&Ps.
I use CCI Blazer for cheap stuff. Federal Am. Eagle for quality cheap stuff. Speer Gold Dots for carry.
I do lots of ammo testing. I will be posting ammo tests now that I am a member here. In my experience the TAP is good ammo. It tends to expand less and penetrate more than other hollow points. Hornady uses the XTP bullet in the TAP ammo. That is probably the most accurate bullet design right now.
For target/practice, I've switched from the WWB to Blazer Brass as it is slightly cheaper locally and seems to be a little cleaner than the WWB (I will still shoot WWB if I can't find the Blazer Brass). For SD, I use either Winchester Ranger, Federal HST, or Speer Gold Dot.
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