Like all things, it depends on what kind of case you are needing or wanting. Leather, canvas, wool, combination of all three?
I have made cases from suede leather and bought sleeves for traveling. The last one I got came from Just Sara and has an outer canvas sleeve with a wool lining. I have one made from a heavy wool blanket, Southwestern style for my TVM Virginia rifle that came from Cabelas but it's long enough if not the correct time period. Is this going to be for storing your rifle, carrying it to the field or the range or do you need a hard case for flying?