I think I'll get some sheep casing from Syracuse Casting and try them in that........
There is a small learning curve with natural as well as a casing as small as sheep.
Make sure and allow them to set over night in a bowl of water after separating.
Get a good end cut before trying to get that first edge of casing on the tube.
Don't lose your patience, some sheep casings just will not load, maybe 1 out of 15 and its frustrating. As soon as you realize you've got that one and start with another piece, you'll laugh at yourself for trying to load the bastard for so long.
I catch a small air bubble at the tip makes loading a lot easier also.
Really nothing to it if your eye glasses are current..>.LOL
Good luck, I really do like 'em better I hope you'll see what I see.