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.
I believe those were made from about 2000 to 2003.
Good
NATO 5.56 projectiles are 62 grain, and can be fired through a Mini 14.
Ruger has a sn function on their web site.
@ 4kilos
No. Your Mini-14 is a 183 series. The first three numbers in the serial number, followed by a dash, are the series code. Ruger made changes to the Mini-14 with the introduction of the 181 series. Many 180 series Mini-14 parts do not interchange with 181 and later series parts.
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
Chamber pressure is determined by the cartridge, not the rifle.
Freud - mini-series - was created on 1984-09-14.
580 is the newer version of the Mini 14 Ranch, minor engineering changes, improved accuracy, etc.
You will have to contact Ruger or look it up on their website since you don't provide the full sn.