S&w M&p 15t

[Jst1mr]

I recently got the M&P 15 tactical AR-type rifle made by S&W. It is chambered for 5.56 (not .223 Rem) and has a 1:9 twist rate. What will tend to be the most accurate bullet weight(s) for this rifle, and can I expect the same accuracy (or greater or less) when shooting .223 Rem ammunition?

 

[Jimmie]

Experiment with 55 grain and up. You may or may not see any appreciable difference in accuracy with heavier bullets. My 1:8 shoots 55gr great and I didn't see any real gains going heavier, 55s are cheap and available, so that's what it gets.

Theoretically, you'd lose accuracy shooting .223, but again, I doubt it'll be noticeable unless you're a national match shooter with good sights, a solid rest, etc, etc, etc.

 

[CDignition]

62 grain will be the functional maximum.. if ur using surplus it wont matter... If you're handloading theres alot more to worry about for the time being, dont worry about it.

 

[jackdanson]

I have the same rifle and I use 55 gr. Lake City FMJ, it seems to work perfectly fine. I've used some various heavier rounds, if they shot any better it wasn't measurable/noticeable.

 

[Ridgerunner665]

55 - 69 grains...mine likes 62 grain bullets best.

 

[los]

My 15T is a tack driver with Horny TAP 55gr ammo.

 

[Jst1mr]

los,
Nice looking setup!!! I have an EoTech on mine, but will be looking for a scope as well. What are the specs on the one in your case?

 

[los]

Thanks.

It's a Millett TRS-1.

It has an illuminated (intensity adjustible) mil-dot reticle and 4-16x50mm. Got it attached to an ADM QD Recon-S mount. Awesome combination.