A stronger lockup and a faster lock time are certainly factors as is bedding.Most bolt actions also have better triggers that can be adjusted,which makes it easier for the shooter to be more consistant.It is also easier to make small changes such as lapping the lugsto improve accuracy even morewith mostbolt actions.If youdesire to build a very accurate customrifle,it is easier to do with a bolt action,because there is a far better selection of products such as triggers,firing pin assemblies and stocks,and it is usuallysimpler to install a custom barrel on a bolt action than on most other actions.All bolt actions are not more accurate than all non-bolt actions,but on average,the bolt actions do hold an accuracy advantage.