For a given amount of money, generally, yes, the bolt-action is more likely to shoot tighter groups.
Accuracy depends mostly on the quality of the barrel, the quality of the lockup of the bolt to the barrel, and the bedding of the receiver.
Equality in barrels is easy.
Lockup is not difficult, but more precision in the machining and clearance between the bolt and the receiver is needed for a semi-auto to cycle reliably. More precision means more $$$.
Generally, it's very easy to bed a bolt-action into a one-piece stock--so, generally, fewer $$$.
I had a Bushmaster Match Target that was quite reliably half-MOA. I have a Ruger 77 Mk II, also a .223, which is reliably half-MOA. Do a price comparison.