I find trying to measure sabots thickness is difficult if not impossible as some if not all seem to have thinner petals near the top but taper to thicker at the bottom and when the bullet is in the sabot it is usually slightly off the base of the sabot. When the bullet is pushed with the ramrod it forces it to the bottom of the sabot and into the thicker section making the OD larger. Generally Harvester sabots seem to be easier to load in my Omega which is real tight and most sabots won't go down with all my weight on the ramrod. Unfortunately I only weigh 158 lbs. When the sabots load that hard I find it nearly impossible to determine what compression I am putting on the powder charge and cannot get decent shot to shot comparison. Powerbelts shoot more consistently for me and I am sure it is because I can seat the bullet on the powder the same each time.