When it comes to all the variables to an AR its easy to start over thinking stuff. Lately I started wondering if 55 grain ammo had enough stopping power. The civilian market seems to be geared towards 55 grain ammo, at least in the carbine catagory and optics and such are tuned to 55 grain ballistics. The standard M-16a2 I shot in the Marines was 62 grain ball. I know theres differences in barrel length and rifle twists that have a lot to do with the best performance of ammo and etc, etc.
I was curious if anyone experimented with both ammo and found much difference at say 200 yards. I would assume there would be more bullet drop with the 62 grains naturally but enough to really matter? I'm really more concerned with a carbine rifle and if its a good option to consider. Or am I just thinking to much into this??