Assuming the "Phantom" is a suppressor/silencer...?
If so, you and I have VERY similar setups. Mine's a 14.5" Bushmaster with 1/9 twist, using an AAC "M4-2000" silencer, DSA stock and Leupold compact scope on an A2 carry handle.
There's the perennial debate between "light bullets for velocity" and "heavy bullets for penetration" with the 5.56/.223. In mine, due to the short barrel, short-to-medium ranges expected, and situations used, I stick with 55-60 grain bullets.
Especially when indoors use is a factor, I prefer the lower penetration of the lighter loads. My first magazine (20-round) is Federal Ballistic Tips. These are seen by some as under-penetrating, but when I've need one round on duty, it's been either for a vehicle-wounded animal or feral dogs, and I prefer the lower-penetrating round for liability reasons. (We're a mostly rural area, but getting more crowded every year.)
The Ballistic Tips "should" pose less risk to people in the next room or apartment, or to my kids in their room at night.
After the first 20-rd mag, I carry two 30's of 55-gr Remington softpoint, and one 30-rd of Q3131A.
May not be "ideal" choices, but at the short ranges and enclosed spaces I carry it, I want to minimize risk to innocents, even if at the cost of some small level of effectiveness. Basically, the 55-grain ballistic tip may not be the "best" stopper, but it's still a disrupting .223 bullet, and at ten yards, it's not going to be worthless, either.
Might want to check out the "Terminal Performance Anxiety" thread pinned at the top. I expect that many of us (myself included) tend to be over-anxious about having the "perfect" load. IMO, as long as you get a "decent" amount of penetration (avoid the obvious 'varmint' loads), combined with dumping 1,200 ft/lbs of energy in your target, you're probably ok.