There is a HUGE differance between what can be done and what is practical. The experts will explain all the details of why it is not a practical or even possible. A fairly simple conversion would be the .221 Fireball. Feeding is problematic but using a single shot follower would solve this. The Hornet is a unique and wonderful cartridge that is a joy to shoot and I would not concider not having one in the safe. The .221 is easier to live with though.
Terrier