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It would be better not to hunt with subsonic ammunition. There isn't a soft point around that will expand at that low of velocity. Subs would only be good if you are headshooting pigs. An arrow would be better than subs. Much bigger hole.Is 223 not allowed? With proper bullet choice
Also if short range 300 blk subs do not kick
6.8spc or 6.5 Grendel would be a very good choice.
Grendel is far superior in bullet selection and BC. Keeps energy downrange. Flatter shooting. It's the way to go if she can put the bullet in the right spot. And if you get a good cut rifle, they can be extremely accurate. My Satern bbl.'d 20" does .33MOA regular with the right handloads. Probably my favorite caliber in the AR platform, likely the best all around.
For a hunting rifle I'd try to keep it light though. Flute the barrel maybe. Look at AA, he has a sale going on on his uppers. He's used nothing but the best barrels in the past, not sure what's in 'em now but I'd suspect good ones.
.300BLK is amazing for the shorter ranges and it has basically no recoil either. Grendel is bit snappier than 5.56 but not enough to talk about.