ken i cant help but think if you changed over the the rhinehart target the ibo will have to become the ivo. international varmithunters association. man those things are small, and not durable at all. some of our local clubs tried them, and the only lasted a few shoots. sure they come with an extra mid section, but if you can shoot a mckenzie for a year, why shoot the "r" targets? stay with durablility, and shooter preference.