They are 38-42mm hog casings. After 3 weeks the small ones have lost 37-38% and the larger ones average 31-33%. I cut a small one open and it looked like it had case hardened. I cant see why when my RH was always at the upper end of the limits. I have started spritzing them again to try and soften the casings. They are not totally hardened just on the ends and in certain areas.
Heres a photo of a small one cut open