Cerephim, let us know how it went!
I have a 527 Lux in 223 from 2016 that wasn't all that accurate at first; 1-2" groups with factory ammo was the norm. Handloads were a little better, but not much. One thing you can try is the CZ Roll Pin pillar trick. There is usually a roll pin in the rear action screw hole; I took another roll pin, measured the height for the front action screw hole in the wood, cut and filed a roll pin to just a touch above that (so it sits on the pin and not the wood) and try that. Then make a new rear roll pin that is the same height above the wood depth as the front pin is taller above the wood depth; this will let the action ride on the pins that can't compress and not the wooden stock, which can compress (AKA pillar bedding the rifle, but using inexpensive roll pins and no epoxy to try it out first). You get a more consistent tightening of the action screws, too. One of the first groups I shot with it was horizontally spread, but vertically very tight. So I opened up the barrel channel a bit (especially around the sight block) and that improved things a lot and then did the epoxy bedding like I described in the other post.
