I have a K31 that I would really like to take Deer Hunting, but I don't know if I get stopped by a CO if they will be cartridge savvy enough to know that the 7.5 x 55 uses a 30 caliber bullet. I think it would be neat to take an animal with the old rifle. So what is your guys/gals opinion? Take the chance and not worry about it or just grab the .243 out of the safe and call it good.