Pre-2007 or Post 2008 Manufacture? Look at the first 3 prefix of the Serial Number on the left side of receiver. #580- is Post-2008.
Failure to FEED or Fire..?
Lacquered Steel or Polymer Steel cased?
What brand of Magazines? Ruger, Tapco, Pro-mag, Etc.?
Also take a photo of the bolt face, the area around the firing pin, and see if you can send that or post that.
Does it appear that the bolt face has a "volcano" around the firing pin hole? If so, you will want to lightly grind (with sandpaper, gently) this volcano flat.
You may also want to look at a Longer Firing Pin to keep from having misfires with Soviet Hard primers. $65
Accuracy Systems
https://www.ruger-mini-14-firearms.com/Bolts-Firing-Pins-More.phpThe Mini-14/30 is an under rated rifle left in the rough due to Bill Ruger's negligence and deliberate inefficiencies to keep the rifle from being reliable for the US Market. The MINI-14 AC556 Did not have these deliberate failures designed into it, as it was meant for Military Trials with the US and other friendly Nations.
That should get you down on the right path.
Gnome