You didn't mention what M&P you'll be keeping these in. If it's a compact then you might splurge for Speer's pricey 124gr Gold Dot Short Barrel cartridge. I keep the 180gr version in my 3" Kahr PM40.
http://ammunitiontogo.com/catalog/product_...products_id=655
I'm not a 9mm guy (although I do own several) so just speaking from just reading this and that, for a full sized pistol I'd probably lean toward Speer 124gr +P Gold Dot or Federal 124gr Tactical +P HST, unless you expect to be shooting through car doors. Then the Tactical Bonded are supposed to be a bit better. The Federals are also supposed to be very low flash.
http://ammunitiontogo.com/catalog/product_...roducts_id=1165
McNett's DoubleTap claims awe inspiring performance at a reasonable price but I've never seen independent tests. Sight unseen I'd be concerned about the possibility of huge amount of flash from anything loaded that hot. But like I said I've never read anything but marketing.
Anyway here's what I keep in my SD pistols.
Full sized .45acp... Federal 230gr HST +P
Bare Gelatin: 12.75” / 1.043”
Heavy Clothing: 14.0” / 0.850”
3" .45 acp... Federal 230gr Bonded +P because of their claimed efficiency from shorties
3" 40S&W... The pricey Speer 180gr Short Barrel load, or 180gr Rangers just because I have a bunch.
BTW: John over at Ammunition To Go is a good guy and a wealth of information.
