My best experience has been with a CZ 527 Varmint. Amazing out of the box accuracy, some guys don't like the set trigger, but I tuned the trigger in unset mode to a crisp break just under 3 lbs. It loves 69gr HPBT Sierra's, and they do a great job on coyotes. I have got .5moa to 525 yards so far, and last weekend I was able to hit a 24" gong at 1000 Yds several times in a row.
With my reloaded 69's, it will shoot .25moa. It also really likes 55gr vmax, sp's, and sierra hp's. Any of these are cake to find a load that shoots under 1", usually closer to .5moa. Other than tuning the trigger, which is just adjustments...no grinding or replacement, this gun is bone stock and i LOVE it! It still holds this accuracy with close to 3000 rounds down the tube.