It's the same barrel just shorter. My X7 is plenty accurate. There are inaccurate individuals from every brand and model, but I'd guess it's usually a load selection issue.
The other possibility is that the X7 is marketed as the "mountain" Omega, being short and light with open sights for Colorado's elk regulations. However, Omegas in general are reported not to shoot conicals well due to the QLA (sabots do fine, I always wondered why this would be so but believe it from some reliable individuals). This could lead to reports of bad accuracy due to people trying to shoot conicals out of them and being disappointed.