Ruger Ranch Rifle
I don't disagree with any of the earlier answers concerning inaccuracy of the 223 ranch rifle. But you asked about "varmint hunting" and that is a very broad area to cover. The ranch rifle seems to be a useable tool, carry along in the truck or on the 4-wheeler for use at short distances. Kind of a modern-day application of the old Model 94 Winchester, it was just meant to be a handy tool. My complaint about the Mini is the same as the other brass belchers -- they spit the brass away and it takes awhile to find it (yes, I reload). I've used my ranch rifle for close work (night calling, etc.), but wouldn't expect to rely on it much farther than I can throw a rock. And yep, at night the muzzle flash is spectacular.