Actually, reloading for your AR15 is a little more cut and dried than for other calibers. For instance, there's only two primers you should be using and positively do not use others. You want to use Rem 7-1/2's or the CCI Mil-Spec primer (#41?).
Powders I've had good results with
IMR-4064
BLC-2
IMR-4895
H-335
RL-15
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