Originally Posted by
MegademiC
A pcc with 124gr is going to be similar in size and sound to a 300blk with supers, so the obvious choice would be the rifle which gives you rifle terminal performance.
The only benefits to 9mm would be mag/ammo simplicity, and size if you go to something with the mag in the grip, or a super short barrel, in which case you need to evaluate what your size requirements are.
Running subs in 300blk is basically an oversized pcc. There are some rounds that look to offer good 300blk subsonic performance, but its still closer to pistol ballistics, and a niche product. I also havent seen professonal tests of these rounds yet, but they definitely have decent potential, for what they are.
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