A couple of things to look for accuracy-wise for the 527.
I’d start by bedding the recoil lug and the tang.
Second, when you remove the barreled action from the stock, the magazine release just floats inside its little space between the magazine and the stock. It can move out of wack just a hair when you reassemble, which is kind of a PITA, and put pressure on the magazine. If that happens you can expect some associated effect on accuracy.
Mine was about 1.5 MOA out of the box. Those two changes/points of concern were addressed and the rifle is easily sub-MOA for 5 shot groups now.
