Your question is a little difficult to understand but I think what your saying is if you zero your AR15 at 100 yards will it always shoot in the same spot with different brands of ammo.
The answer is no.
It will be close. I am gonna go out on a limb and assume your just target practicing with varied ammo @ 100 yards and it will be unlikely you will see too much of a shift from your original zero at 100 yards.
Originally Posted By QAM:
I read an article about zeroing 223 round.
From my understanding the 223 (if zeroed at 100 m) will never rise above line of sight. Is this only valid to some specific ammo bran d and AR15 plaatforms or is this fir all 223 and other weapons in 223 as well?