100-435 USD
580 is the newer version of the Mini 14 Ranch, minor engineering changes, improved accuracy, etc.
Ruger has a sn function on their web site.
The Ruger Mini-14 Ranch Rifle marked as .223 can safely fire the .223 AND the 5.56 NATO military cartridge. The Ruger Mini-14 TARGET model should only fire .223 ammo- no 5.56 mm
You must contact Ruger to avoid voiding the warranty for a correct answer.
You will have to contact Ruger or look it up on their website since you don't provide the full sn.
According to Rugers web site the twist on a Ruger Mini 14 Ranch is 1:9' RH. But I believe that changed from 1:10 to 1:9 in the mid 1980's.
This gun is made by Ruger and is available in the ranch rifle of standard version. Also a target version with a barrel stabilizer.
The Ruger Web site says the Mini-14 Ranch Rifle and the Mini-14 Tactical Rifle, can be used with either the .223 or 5.56mm round: Mini-14 Target Rifles ONLY accept .223 Rem. ammunition. 5.56 NATO cannot be used in this model. Probably due to tighter chambering dimensions for accuracy.
You will have to call Ruger.
The early model mini 14 was not designed for a scope. After market mounts and rings came out so a scope could be added, however the angle of ejection was not set for a scope so the brass would bang into the scope. The Ranch rifle came with the scope mount as part of the receiver, and the ejection angle was changed to kick the brass lower and to the right more. I had a couple of the early mini's and scoped one of them. I lived with the dinged brass, and just used full length resizing dies to reload it. The Mini-14 is chambered in .223 and the Mini 30 is chambered in 7.62x39. Both come in the ranch rifle configuration.
Semi automatic rifle made by Ruger.
Your series 197 Mini 14 was built in 2004 (or later) by Ruger according to their own website. Look up when your rifle was built there. I purchased a series 197 Ranch rifle in 2005 for around $550.00.