Brace yourself for a non-helpful post:
I've seen and heard of a lot of people having issues shooting. Invariably the gun or gun/ammo combination is blamed. Often as not, the issue is really just an operator headspacing issue. Half of this is because the shooter is making some mechanical error, the other half is down to expectations. People on forums in general don't post crappy groups. Sometimes you'll see a group off to one side of their glory shot where they say they were just "sighting in" or some other excuse or just ignore the bad group off to the side of the frame entirely. This leads to unreasonably high expectations for what a gun can do, as people think every group of theirs should look as good as the glory shots going up on the forum. And precision shooting is a mind game, so if you can't get out of your own head you're going to keep pulling shots only making the problem worse. If you expect a gun to perform poorly, it will perform poorly.
So all that is well and good to say. My best advice to someone who is having a hard time shooting is hand the gun to someone else who is printing great groups. Let them shoot it a bit, without hovering over them, and see what they say.
As for the Crown specifically, try a couple groups hand-loaded. I've said it before, I'll say it again: these pre-sprung magazines are flier machines. Shoot indoors with dead calm air too, sandbags front and back, if you can. Take target pictures, put them up here, and lets revisit again.