I am about to have my first AR built and these two calibers are my final two choices. I don't know which one to get. I am gonna be deer and hog hunting with it at a range of a maximum of 600the yrds. The only problem I am having in deciding is the Creedmoor is considerably more to build but offers more bullet choices from hornady(which is my preferred brand) and the Grendel is way way cheaper to build but has only one ammo choice. Help please I am wanting to start building next week!