I own a Mini-Mark X 223 that puts 3 into 3/4" regularly. Always in the same place. I've shot 2 - 3 shot groups of 3/8" on a VERY good (probably lucky) day.
Prairie dog and coyote killer. After about 3 - 4 shots, it starts walking, however.
10 shot group would take a while smile ! VERY light barrel on that one - a pleasure to carry, though.

I've always been a curmudgeon - now I'm an old curmudgeon.
~Molɔ̀ːn Labé Skýla~