I really like the possum hollow bore guides, but after searching the web and looking at their compatibility chart, I am still having a hard time figuring out what number bore guide works with Ruger American Predator rifles (243/6mm CM) and the Ruger Precision (6.5 CM) (maybe the same one?)....and while we are at it, the Ruger Ranch in a 223. Does anyone know what number works with those rifles? I have tried calling them, but the no one ever answers and the voicemail is full. Any help would be appreciated. Thanks