I chronographed one batch a while back and found as much as 250 fps variation, shot to shot. That, in a .454, is too much for me. Had a similar situation in some .45 Colt loads (200 grainers). The .454 was out of a FA 83, the .45 Colt out of a FA 97.
I am sure a lot of folks are very happy with Cor Bon, just not me.