I know we dont have "factory" x guns in .223 & .22-250 yet, but I wanted to share this anyway. A couple of weeks ago I fired a 3 shot group out of my b-in-laws rem 700 .223 that measured .429". It chronographed 3423 fps. Today I fired a 5 shot group out of my Mini Mark X .223 it measured 1.45" & chronographed 3225 fps. MMX has a 20" barrel. MMX is also very picky about what it shoots. I also fired a 3 shot group out of my sons Stevens 200 .22-250 it measured .378" & chronographed 3450 fps. This is the best group ever out of this gun. The claimed muzzle velocity was right on the money with the .223 but wasnt even close in the .22-250. All groups were at 100 yds.