I have been lucky so far with sheep I guess. I will say this though, the time I tried to "ease" my work load by loading 4 casing on the tube before starting was a mistake. Even with a 24 hour soak, AND doing a water load, they worked fine for one casing. Second was a bit more touchy, third one started hanging on the tube and the 4th was blow out city. So I assumed from that that they need more moisture than hog casing.
The water loading helps a lot with loading but...... it also causes a lot more stickage when trying to slide down the tube. I decided and now I always polish the tube then lub well before loading. When its sticks I pick when and where to cut it off, tie it, and then slide the casing back up the tube out of the way and re-lube the tube.
I have also noticed that the silicone spray food lube, will last much longer than using veggie oil for lubrication. But its sorta expensive that way.
I am a rookie and don't know any better, but my Pop told me to get an oily rag and wipe down the stuffed casing before smoking to oil and lub the casings to prevent blow outs.
What ever it is, I have been really lucky.
Hope it all works out Goliath.
BTW, I use Butchers & Packers casings mostly.