Please email us at techsales@opticsplanet.com so we can further answer your question.
The Hornady Frontier 5.56x45mm NATO 75 grain Boat Tail Hollow Point (BTHP) Brass Centerfire Rifle Ammunition is generally used to target shoot.
Hornady does not state the COAL of the Hornady Frontier 5.56x45mm NATO 75 grain Boat Tail Hollow Point ammo. I recommend contacting Hornady for that information.
The Hornady Frontier 5.56x45mm NATO 75 grain Boat Tail Hollow Point ammo is manufactured by Lake City Ammunition Plant and is abbreviated LC. Please email us at techsales@opticsplanet.com for more information.
On average the barrel life of an AR15 barrel is about 20000 rounds. The difference in barrel wear between the two bullets you mentioned are not going to be that noticeable. I recommend selecting the ammo that shoots the best out of your gun and sticking with that.
The Hornady Frontier 5.56x45mm NATO 75 grain uses a Boat Tail Hollow Point bullet. So it is not a soft point bullet like a Remington Core Lokt bullet.
If you have a 5.56 NATO barrel which I believe all smith and Wesson M&P 15 barrels are then yes. also barrel twist should be 1:7 or 1:8 for best results