I had these lovely Coopworth locks that I tailspun. They were easy to work with.
There are many breeds that you can tail spin. People often think of just Wensleydale and Teeswater. These are lovely to spin but check out this
Gotland
If you are having a hard time spinning a thick single to make a supercoil. Try using some of your corespun yarn. Corespun can be spun thick just by using a thick core, like mohair. Then you can easily supercoil this.
Some of my corespun supercooled.
Corespinning art yarn.
It is great fun to spin beehives and locks into your corespun yarn, If you are just learning to add beehives try using fiber from your batt, or matching fiber, your mistakes won't show.