This is a new response to an older thread regarding Ruger 580 series Ranch Rifles having feeding problems with Hi-Caps mags.
I took mine out to the ranch today in unfired condition. I had 2 used Ruger made 20 rounders, 2 Eagle Industries 30 round polycarbonate mags and a 20 round new Pro mag steel magazine. I fired 300 rounds out of it, more for feeding and break-in rather then refined accuracy. The two Ruger mags performed flawlessly, in spite of looking pretty rough. The Pro mag had one failure to feed out of 60 rounds and that was in the first loading. The Eagle mags worked as well as the Rugers. In other words, I had no real problems with a new 580 series Ranch Rifle starting as unfired with mostly new mags. I honestly think that any problems with the new 580 series must be considered as an individual firearm problem, ammo problem or bad mags. I am happy with my Mini-14, and did manage several 1" groups +/- at 50 yards with a 2-7 scope mounted. I am curious to see how it does after some basic work is done on the gritty heavy trigger and some experimenting with some of my favorite loads.