I have 3 of their carbons, all 3 are pretty accurate. The last one is a m24 contour 300wsm, I ordered that barrel just after they came out with the heavier contour carbon. It shoots very well, I have shot many 5 shot groups in the .3moa range, and quite a few under 1/2 moa at 500-1000y. My goals for the carbons are not f-class or br level accuracy, more like the being able to setup the rifle (bipod/rear bag) and put 5 shots under 1moa out to 1000y including the cold bore shot.
They really have become my go to lately, I have 6 of their barrels in total. All 6 have shot well, cleaned up easy and IBI has been good on the customer service side.