Wolf Gold is good. I like anything from Lake City. Honestly, most of the 556 ammo out there is pretty good. Your rifle will shoot just about any bullet weight. If you are looking at less than 100 yards, like you said, I don't think the bullet weight makes much difference in your gun. I would not shoot steel case ammo for home defense. I have shot thousands and thousands of 5.56 of all types and I can say the most common malfunction comes from when I used steel case ammo. It's still rare but happens more than others with a brass case. if it is purely for home defense and you are worried about over-penetration they make a round called Frangible. It basically disintegrates when it hits something. It can also be used to shoot steel closer than you would want with normal ammo because of splatter coming back at you. I think PSA parts kits are not as good. I have seen their bolt carriers have issues on the range. Maybe Quality check the rifle with a gunsmith. There is a youtube channel for the School of the American Rifle. It is worth watching the videos, it's like an armorers course. I really like their content. Get 500 rounds of something you can afford in bulk and go shoot 3-5 hundred rounds in one sitting. Really test the gun, get it hot and dirty, and see what happens. Make sure what you have is dependable.
If you buy a lot of ammo targetsportsusa dot com Prime membership is good. I have been buying from them for years. They have a good selection normally. Unfortunately, you are starting to buy ammo when it is still overpriced imho. To get good with your gun you need to shoot it. So break out the credit card.
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