i just recived there catolog today and i had lookat there SUB-MOA sereies and i noticed that they only offertwo weahterby catridge loading. for this series and that is the 257 wby mag and 300 wby mag.
the other chambering arethe 223rem 22 250rem 243win 270win 308win 30 06springfield 257 wby mag 270wsm 7mm 300 win mag 300 wby mag 338 win mag.

that alone speaks wonders about weahterby catrdige accuracy. that they cant garuntee the rest to shoot sub-MOA