Accuracy is a relative thing. An inaccurate rifle is usually one that does not perform to the level the owner expects. What is acceptable is sometimes determined by the application. A deer hunting rifle may need to be only capable of 2 to 3 MOA to be effective for the task. A target rifle needs to be sub-MOA. Mr Pfleuger posted many contributing factors but also consider that even with the best parts and the finest smith's talents there are no guarantees that every one will give stellar performance. The operator also needs to know their limits before questioning the ability of the rifle.
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Distinguished Rifleman #731