Hi. I know every rifle is different even with the same models but what have you M&P 15 Sport II owners have found to be the best weight bullets and ammo manufactories for yours as far as accuracy at 100yds?

I am getting moa at 100 yards using Federal American Eagle 55gr. 5.56 ammo @ 3240fps.. Tried it, liked it and have not shot anything else...

Dave

I picked up a box of American Eagle at Wal-Mart and it is ugly. I have not used any of it but it looks nasty. I have never seen new brass look so bad. Hope it works.

Dave 270 will take it if you don't want it.....maybe it shoots better than it looks.

Just how bad does the stuff look ... photo's ?

If it's XM193 then it won't look pretty. It is left unpolished for military inspection (to confirm annealing process).

It'll work.

I use mostly 55 grains. The Sports eat everything, so buy what you want.

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Still carrying my S&W 642

PMC Bronze 55 grain FMJ shoots fine out of my AR-15's including my S&W Sport II and it has a brass case. It is on sale a lot and that's when I buy it.

It comes with a 1-9 twist barrel, so 55 grain bullets would be my choice.

M193 is military ammo. It's job is to shoot not to look at. It will shot exectly the same as a shiny pretty case

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I have an AR15 with a 1:8 5R barrel ... my gun loves 69 Grain

AR–15 Barrel Twist Explained

Bullet Weight: The Ideal Rate of Twist

So to simplify this for you, here is a chart you may want to print:

Bullet Weight Twist
40-Grain 1:12
55-Grain 1:9
62-Grain 1:8 or 1:7
77-Grain 1:7 or 1:8
80-Grain 1:7

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Thank You
Wayne