Agreed with others. Do not load for other people. I don't like anyone using my loads, and I don't ever use anyone else's either. It would be like sharing a soup spoon.
Fortunately, your handloads shot great in his rifle, but for those who struggle with the same issue, here's my $0.02:
Black Hills is a proven ammo. It is capable of 1/2moa. Yes, some rifles have tastes and others are picky, but people exaggerate that on the web. In .223 there are a few "go to" loads. One of them is the 69smk in 1/9's loaded with TAC or Varget. Another would be a 52/53/55 match bullet with 335. If a rifle doesn't shoot one of the bread and butter loads - it is time to get rid of the rifle. Some of these loads have been proven to be tack-drivers for decades in tens of thousands of rifles and by thousands of competitors. The wrong way to go about it is to spend a lot of money buying factory loads or time and money making dozens of various handloads to find the magic load that the rifle finally likes. Usually doesn't happen. Don't reinvent the wheel. Nothing you or I will do with a .223 will be new or innovative. Everything has been tried and tested to death. In fact, BH and Federal have done more research and testing on this subject than we can imagine - which is how they developed their match loads which are so accurate in just about anything you feed them to. They are made to be accurate across a huge range of variables..first and foremost being different guns..
My advice is simple. If you buy a .223 and you want to see what it can do before you commit to buying other ammos or handloading. Buy a box of 69gr Federal Gold Medal Match. It's expensive, but do it. Shoot it. If it doesn't shoot well, it's the gun. Don't be one of these guys who makes endless excuses for a gun that won't shoot. When I used to say that, people would jump on me with "yeah, but my gun didn't like it but it shot .00001moa groups with X brand" ...yeah right. Maybe, but I'd like to see it myself. Let's be real here. A barrel has what characteristics that makes it shoot a proven load like that poorly, but will shoot something else into match-grade quality? BS.
The beauty of handloads is that you can tweak the load to your rifle's liking. That's IF the dang thing shoots in the first place. People think they can take a gun that shoots FGMM into 2" and make it sub-moa with handloading. Sorry, but FGMM or BlackHills is really, really good ammo. Handloading can give you up to 25% increase. That would take a 1moa load and make it .75moa. Or something that shoots 2" and put it into 1.5". That is because you can find the velocity your barrel likes, that is, the point at which the barrel is vibrating at it's highest/lowest point when the bullet leaves the muzzle. You can also seat closer to the lands. Again...all of this wins you 25% give or take.
Find a good match load like one of BH...they offer high quality match loads in a few different bullets, or Federal's 69. No need to look further. If they don't shoot - it's the gun.