For use with a standard AR lower, I'd recommend something chambered for 6.8SPC II.I am looking to build the rifle on a standard AR lower. I want a good hog and deer gun.
That's not a standard "AR lower", by which I believe the OP meant a standard AR-15 lower.What's wrong with .308, or 7.62?
Should be perfect for what you intend to use it on.
I would imagine that ammo would be cheaper, and more options available.
That's not a standard "AR lower", by which I believe the OP meant a standard AR-15 lower.
And, being afield for a day of hunting, the AR-15 size guns are generally a good bit lighter than the .308/AR-10 size guns.
A good resource is here: http://68forums.com/forums/forum.php
The Grendel IS a good choice; however, it's main virtues are being a good long-range round--like it really shows it's stuff out beyond 800 yards or so--as compared to the 6.8SPC II. However, what ethical hunter in Texas is shooting game at 800+ yards distance? . . . I'll wait . . . but I'm pretty damn certain the answer is "no one". Grendels also tend to prefer longer barrels than 16" to be at their best.Grendel.
For full disclosure, I've got one and have followed the cartridge for a while. I've have seen what it does on game and from how far out it can do it.