Originally Posted by JTJ
The Mini 14 is chambered for 5.56x45 except for the target model which is chambered for 223. 223 may be fired in a 5.56x45 chamber but not a good idea to shoot 5.56 in a 223 chamber.
it is my understanding that the target model does not differ from the ranch in regards to reciever cababilities and other than having no rear sight, they are both equal. The reason the .223 remington is specified for the target modle instead of NATO rounds is due to the addtion of the harmonic device on the end of the barrel which causes the rifle to develop higher pressure and thus pushes the overall configuration over the threshold of what Ruger feels is safe.