A .223 with the right bullet will cleanly kill deer all day long. SO if you are looking for a pre built "black" rifle, most of them come in .223 so you are good to go right there.
I built my MDI in 6.5 Grendel and would have no problem shooting a deer at 400 yards with it, so 6.5 Grendel is great if you want a bit more bullet weight, and if you want to assemble your own rifle from a receiver set like the ones that MDI or ATRS offer.
I built my MDI in 6.5 Grendel and would have no problem shooting a deer at 400 yards with it, so 6.5 Grendel is great if you want a bit more bullet weight, and if you want to assemble your own rifle from a receiver set like the ones that MDI or ATRS offer.


















































